From ea3e92aa5e68e73fa95196332b739891bbf3f24f Mon Sep 17 00:00:00 2001
From: Maxime Coste <frrrwww@gmail.com>
Date: Mon, 12 May 2014 23:25:15 +0100
Subject: [PATCH] SelectionList know its buffer and timestamp

---
 src/buffer.cc                 |  2 +-
 src/client.cc                 |  4 +-
 src/client_manager.cc         |  6 +--
 src/client_manager.hh         |  3 +-
 src/commands.cc               | 16 +++++---
 src/context.cc                | 10 ++---
 src/context.hh                |  3 +-
 src/dynamic_selection_list.cc | 25 ++----------
 src/dynamic_selection_list.hh |  5 ++-
 src/input_handler.cc          |  4 +-
 src/input_handler.hh          |  2 +-
 src/normal.cc                 | 28 ++++++++------
 src/selection.cc              | 71 ++++++++++++++++++++++++++++++++++-
 src/selection.hh              | 40 +++++++++-----------
 src/selectors.cc              |  6 +--
 src/selectors.hh              |  4 +-
 src/window.cc                 |  8 ++--
 17 files changed, 150 insertions(+), 87 deletions(-)

diff --git a/src/buffer.cc b/src/buffer.cc
index f4b6782f..4e7c2606 100644
--- a/src/buffer.cc
+++ b/src/buffer.cc
@@ -706,7 +706,7 @@ void Buffer::on_option_changed(const Option& option)
 
 void Buffer::run_hook_in_own_context(const String& hook_name, const String& param)
 {
-    InputHandler hook_handler(*this, { Selection{} });
+    InputHandler hook_handler({ *this, Selection{} });
     m_hooks.run_hook(hook_name, param, hook_handler.context());
 }
 
diff --git a/src/client.cc b/src/client.cc
index 5be59b99..dacaf607 100644
--- a/src/client.cc
+++ b/src/client.cc
@@ -18,7 +18,7 @@ Client::Client(std::unique_ptr<UserInterface>&& ui,
                EnvVarMap env_vars,
                String name)
     : m_ui{std::move(ui)}, m_window{std::move(window)},
-      m_input_handler{m_window->buffer(), std::move(selections),
+      m_input_handler{std::move(selections),
                       std::move(name)},
       m_env_vars(env_vars)
 {
@@ -102,7 +102,7 @@ static void reload_buffer(Context& context, const String& filename)
     if (not buf)
         return;
     context.change_buffer(*buf);
-    context.selections() = SelectionList{buf->clamp(cursor_pos)};
+    context.selections() = SelectionList{ *buf, buf->clamp(cursor_pos)};
     context.window().set_position(view_pos);
     context.print_status({ "'" + buf->display_name() + "' reloaded",
                            get_color("Information") });
diff --git a/src/client_manager.cc b/src/client_manager.cc
index 6e3fd638..692a1a46 100644
--- a/src/client_manager.cc
+++ b/src/client_manager.cc
@@ -94,18 +94,18 @@ WindowAndSelections ClientManager::get_free_window(Buffer& buffer)
             w->forget_timestamp();
             WindowAndSelections res = std::move(*it);
             m_free_windows.erase(it.base()-1);
+            res.selections.update();
             return res;
         }
     }
     return WindowAndSelections{ std::unique_ptr<Window>{new Window{buffer}},
-                                DynamicSelectionList{buffer,
-                                { Selection{ {}, {} } } } };
+                                SelectionList{ buffer, Selection{} } };
 }
 
 void ClientManager::add_free_window(std::unique_ptr<Window>&& window, SelectionList selections)
 {
     Buffer& buffer = window->buffer();
-    m_free_windows.push_back({ std::move(window), DynamicSelectionList{ buffer, std::move(selections) } });
+    m_free_windows.push_back({ std::move(window), SelectionList{ std::move(selections) }, buffer.timestamp() });
 }
 
 void ClientManager::ensure_no_client_uses_buffer(Buffer& buffer)
diff --git a/src/client_manager.hh b/src/client_manager.hh
index d3334486..410adab5 100644
--- a/src/client_manager.hh
+++ b/src/client_manager.hh
@@ -12,7 +12,8 @@ struct client_removed{};
 struct WindowAndSelections
 {
     std::unique_ptr<Window> window;
-    DynamicSelectionList selections;
+    SelectionList selections;
+    size_t timestamp;
 };
 
 class ClientManager : public Singleton<ClientManager>
diff --git a/src/commands.cc b/src/commands.cc
index e3437dfa..4629c3d1 100644
--- a/src/commands.cc
+++ b/src/commands.cc
@@ -131,7 +131,8 @@ void edit(const ParametersParser& parser, Context& context)
         int column = param_count > 2 and not parser[2].empty() ?
                      std::max(0, str_to_int(parser[2]) - 1) : 0;
 
-        context.selections() = context.buffer().clamp({ line,  column });
+        auto& buffer = context.buffer();
+        context.selections() = { buffer, buffer.clamp({ line,  column }) };
         if (context.has_window())
             context.window().center_line(context.selections().main().cursor().line);
     }
@@ -962,7 +963,7 @@ void context_wrap(const ParametersParser& parser, Context& context, Func func)
         for (auto& name : names)
         {
             Buffer& buffer = BufferManager::instance().get_buffer(name);
-            InputHandler input_handler{buffer, ( Selection{} )};
+            InputHandler input_handler{{ buffer, Selection{} }};
             func(parser, input_handler.context());
         }
         return;
@@ -980,7 +981,7 @@ void context_wrap(const ParametersParser& parser, Context& context, Func func)
 
     if (parser.has_option("draft"))
     {
-        InputHandler input_handler(real_context->buffer(), real_context->selections(), real_context->name());
+        InputHandler input_handler(real_context->selections(), real_context->name());
 
         // We do not want this draft context to commit undo groups if the real one is
         // going to commit the whole thing later
@@ -989,12 +990,17 @@ void context_wrap(const ParametersParser& parser, Context& context, Func func)
 
         if (parser.has_option("itersel"))
         {
-            DynamicSelectionList sels{real_context->buffer(), real_context->selections()};
+            SelectionList sels{real_context->selections()};
             ScopedEdition edition{input_handler.context()};
             for (auto& sel : sels)
             {
-                input_handler.context().selections() = sel;
+                input_handler.context().selections() = SelectionList{ sels.buffer(), sel, sels.timestamp() };
+                input_handler.context().selections().update();
+
                 func(parser, input_handler.context());
+
+                if (&sels.buffer() != &input_handler.context().buffer())
+                    throw runtime_error("the buffer has changed while iterating on selections");
             }
         }
         else
diff --git a/src/context.cc b/src/context.cc
index 00e3ff50..dac65284 100644
--- a/src/context.cc
+++ b/src/context.cc
@@ -10,10 +10,10 @@ namespace Kakoune
 Context::Context() = default;
 Context::~Context() = default;
 
-Context::Context(InputHandler& input_handler, Buffer& buffer,
-                 SelectionList selections, String name)
+Context::Context(InputHandler& input_handler, SelectionList selections,
+                 String name)
     : m_input_handler{&input_handler},
-      m_selections{{buffer, std::move(selections)}},
+      m_selections{std::move(selections)},
       m_name(std::move(name))
 {}
 
@@ -110,7 +110,7 @@ void Context::push_jump()
     }
     m_jump_list.erase(std::remove(begin(m_jump_list), end(m_jump_list), jump),
                       end(m_jump_list));
-    m_jump_list.push_back({buffer(), jump});
+    m_jump_list.push_back(jump);
     m_current_jump = m_jump_list.end();
 }
 
@@ -168,7 +168,7 @@ void Context::change_buffer(Buffer& buffer)
     if (has_client())
         client().change_buffer(buffer);
     else
-        m_selections = DynamicSelectionList{ buffer };
+        m_selections = DynamicSelectionList{ { buffer, Selection{} } };
     if (has_input_handler())
         input_handler().reset_normal_mode();
 }
diff --git a/src/context.hh b/src/context.hh
index 60264aba..f612e36a 100644
--- a/src/context.hh
+++ b/src/context.hh
@@ -26,7 +26,8 @@ class Context
 {
 public:
     Context();
-    Context(InputHandler& input_handler, Buffer& buffer, SelectionList selections, String name = "");
+    Context(InputHandler& input_handler, SelectionList selections,
+            String name = "");
     ~Context();
 
     Context(const Context&) = delete;
diff --git a/src/dynamic_selection_list.cc b/src/dynamic_selection_list.cc
index 2792da30..4087bb0c 100644
--- a/src/dynamic_selection_list.cc
+++ b/src/dynamic_selection_list.cc
@@ -3,10 +3,9 @@
 namespace Kakoune
 {
 
-DynamicSelectionList::DynamicSelectionList(Buffer& buffer,
-                                           SelectionList selections)
+DynamicSelectionList::DynamicSelectionList(SelectionList selections)
     : SelectionList(std::move(selections)),
-      BufferChangeListener_AutoRegister(buffer)
+      BufferChangeListener_AutoRegister(const_cast<Buffer&>(buffer()))
 {
     check_invariant();
 }
@@ -18,32 +17,16 @@ DynamicSelectionList& DynamicSelectionList::operator=(SelectionList selections)
     return *this;
 }
 
-void DynamicSelectionList::check_invariant() const
-{
-#ifdef KAK_DEBUG
-    SelectionList::check_invariant();
-    const Buffer& buffer = registry();
-    for (size_t i = 0; i < size(); ++i)
-    {
-        auto& sel = (*this)[i];
-        kak_assert(buffer.is_valid(sel.anchor()));
-        kak_assert(buffer.is_valid(sel.cursor()));
-        kak_assert(not buffer.is_end(sel.anchor()));
-        kak_assert(not buffer.is_end(sel.cursor()));
-        kak_assert(utf8::is_character_start(buffer.iterator_at(sel.anchor())));
-        kak_assert(utf8::is_character_start(buffer.iterator_at(sel.cursor())));
-    }
-#endif
-}
-
 void DynamicSelectionList::on_insert(const Buffer& buffer, ByteCoord begin, ByteCoord end, bool at_end)
 {
     update_insert(begin, end, at_end);
+    set_timestamp(buffer.timestamp());
 }
 
 void DynamicSelectionList::on_erase(const Buffer& buffer, ByteCoord begin, ByteCoord end, bool at_end)
 {
     update_erase(begin, end, at_end);
+    set_timestamp(buffer.timestamp());
 }
 
 }
diff --git a/src/dynamic_selection_list.hh b/src/dynamic_selection_list.hh
index 2f408907..65f37915 100644
--- a/src/dynamic_selection_list.hh
+++ b/src/dynamic_selection_list.hh
@@ -13,10 +13,11 @@ public:
     using iterator = SelectionList::iterator;
     using const_iterator = SelectionList::const_iterator;
 
-    DynamicSelectionList(Buffer& buffer, SelectionList selections = { Selection{} });
+    DynamicSelectionList(SelectionList selections);
 
     DynamicSelectionList& operator=(SelectionList selections);
-    void check_invariant() const;
+
+    using SelectionList::buffer;
 
 private:
     void on_insert(const Buffer& buffer, ByteCoord begin, ByteCoord end, bool at_end) override;
diff --git a/src/input_handler.cc b/src/input_handler.cc
index f12a8854..62e3068f 100644
--- a/src/input_handler.cc
+++ b/src/input_handler.cc
@@ -875,9 +875,9 @@ void InputMode::reset_normal_mode()
     m_input_handler.reset_normal_mode();
 }
 
-InputHandler::InputHandler(Buffer& buffer, SelectionList selections, String name)
+InputHandler::InputHandler(SelectionList selections, String name)
     : m_mode(new InputModes::Normal(*this)),
-      m_context(*this, buffer, std::move(selections), std::move(name))
+      m_context(*this, std::move(selections), std::move(name))
 {
 }
 
diff --git a/src/input_handler.hh b/src/input_handler.hh
index 0d9d34cc..80b8b43c 100644
--- a/src/input_handler.hh
+++ b/src/input_handler.hh
@@ -35,7 +35,7 @@ enum class InsertMode : unsigned;
 class InputHandler : public SafeCountable
 {
 public:
-    InputHandler(Buffer& buffer, SelectionList selections, String name = "");
+    InputHandler(SelectionList selections, String name = "");
     ~InputHandler();
 
     // switch to insert mode
diff --git a/src/normal.cc b/src/normal.cc
index 45642b22..7ac51ad5 100644
--- a/src/normal.cc
+++ b/src/normal.cc
@@ -26,6 +26,7 @@ void erase(Buffer& buffer, SelectionList& selections)
     for (auto& sel : selections)
     {
         erase(buffer, sel);
+        selections.update();
         avoid_eol(buffer, sel);
     }
     selections.check_invariant();
@@ -178,7 +179,7 @@ void select_coord(const Buffer& buffer, ByteCoord coord, SelectionList& selectio
 {
     coord = buffer.clamp(coord);
     if (mode == SelectMode::Replace)
-        selections = SelectionList { coord };
+        selections = SelectionList{ buffer, coord };
     else if (mode == SelectMode::Extend)
     {
         for (auto& sel : selections)
@@ -598,7 +599,7 @@ void paste(Context& context, int)
 template<typename T>
 void regex_prompt(Context& context, const String prompt, T func)
 {
-    DynamicSelectionList selections{context.buffer(), context.selections()};
+    DynamicSelectionList selections{context.selections()};
     context.input_handler().prompt(prompt, "", get_color("Prompt"), complete_nothing,
         [=](const String& str, PromptEvent event, Context& context) {
             try
@@ -738,7 +739,7 @@ void split_lines(Context& context, int)
 {
     auto& selections = context.selections();
     auto& buffer = context.buffer();
-    SelectionList res;
+    SelectionList res(context.buffer());
     for (auto& sel : selections)
     {
         if (sel.anchor().line == sel.cursor().line)
@@ -760,7 +761,7 @@ void split_lines(Context& context, int)
 void join_select_spaces(Context& context, int)
 {
     auto& buffer = context.buffer();
-    SelectionList selections;
+    SelectionList selections(buffer);
     for (auto& sel : context.selections())
     {
         for (LineCount line = sel.min().line; line <= sel.max().line; ++line)
@@ -783,8 +784,12 @@ void join_select_spaces(Context& context, int)
 
 void join(Context& context, int param)
 {
-    DynamicSelectionList sels{context.buffer(), context.selections()};
-    auto restore_sels = on_scope_end([&]{ context.selections() = std::move(sels); });
+    SelectionList sels{context.selections()};
+    auto restore_sels = on_scope_end([&]{
+        sels.update();
+        context.selections() = std::move(sels);
+    });
+
     join_select_spaces(context, param);
 }
 
@@ -796,7 +801,7 @@ void keep(Context& context, int)
         if (ex.empty())
             return;
         const Buffer& buffer = context.buffer();
-        SelectionList keep;
+        SelectionList keep(buffer);
         for (auto& sel : context.selections())
         {
             if (boost::regex_search(buffer.iterator_at(sel.min()),
@@ -818,7 +823,7 @@ void keep_pipe(Context& context, int)
                 return;
             const Buffer& buffer = context.buffer();
             auto& shell_manager = ShellManager::instance();
-            SelectionList keep;
+            SelectionList keep(buffer);
             for (auto& sel : context.selections())
             {
                 int status = 0;
@@ -839,7 +844,7 @@ void indent(Context& context, int)
     String indent = indent_width == 0 ? "\t" : String{' ', indent_width};
 
     auto& buffer = context.buffer();
-    SelectionList sels;
+    SelectionList sels(buffer);
     for (auto& sel : context.selections())
     {
         for (auto line = sel.min().line; line < sel.max().line+1; ++line)
@@ -864,7 +869,7 @@ void deindent(Context& context, int)
         indent_width = tabstop;
 
     auto& buffer = context.buffer();
-    SelectionList sels;
+    SelectionList sels(buffer);
     for (auto& sel : context.selections())
     {
         for (auto line = sel.min().line; line < sel.max().line+1; ++line)
@@ -1235,7 +1240,7 @@ void spaces_to_tabs(Context& context, int ts)
 
 static SelectionList compute_modified_ranges(const Buffer& buffer, size_t timestamp)
 {
-    SelectionList ranges;
+    SelectionList ranges(buffer);
     for (auto& change : buffer.changes_since(timestamp))
     {
         const ByteCoord& begin = change.begin;
@@ -1264,6 +1269,7 @@ static SelectionList compute_modified_ranges(const Buffer& buffer, size_t timest
     if (ranges.empty())
         return ranges;
 
+    ranges.set_timestamp(buffer.timestamp());
     ranges.set_main_index(ranges.size() - 1);
 
     auto touches = [&](const Selection& lhs, const Selection& rhs) {
diff --git a/src/selection.cc b/src/selection.cc
index 0049689d..895c1f96 100644
--- a/src/selection.cc
+++ b/src/selection.cc
@@ -63,6 +63,7 @@ struct UpdateInsert
             coord.column = end.column + coord.column - begin.column;
 
         coord.line += end.line - begin.line;
+        kak_assert(coord.line >= 0 and coord.column >= 0);
     }
 };
 
@@ -78,7 +79,7 @@ struct UpdateErase
             kak_assert(end.line < coord.line);
         if (not assume_different_line and coord <= end)
         {
-            if (not at_end)
+            if (not at_end or begin == ByteCoord{0,0})
                 coord = begin;
             else
                 coord = begin.column ? ByteCoord{begin.line, begin.column-1}
@@ -94,11 +95,33 @@ struct UpdateErase
             else
                 coord.line -= end.line - begin.line;
         }
+        kak_assert(coord.line >= 0 and coord.column >= 0);
     }
 };
 
 }
 
+SelectionList::SelectionList(const Buffer& buffer)
+    : m_buffer(&buffer), m_timestamp(buffer.timestamp())
+{
+}
+
+SelectionList::SelectionList(const Buffer& buffer, Selection s, size_t timestamp)
+    : m_buffer(&buffer), m_selections({ s }), m_timestamp(timestamp)
+{}
+
+SelectionList::SelectionList(const Buffer& buffer, Selection s)
+    : SelectionList(buffer, s, buffer.timestamp())
+{}
+
+SelectionList::SelectionList(const Buffer& buffer, std::vector<Selection> s, size_t timestamp)
+    : m_buffer(&buffer), m_selections(std::move(s)), m_timestamp(timestamp)
+{}
+
+SelectionList::SelectionList(const Buffer& buffer, std::vector<Selection> s)
+    : SelectionList(buffer, std::move(s), buffer.timestamp())
+{}
+
 void SelectionList::update_insert(ByteCoord begin, ByteCoord end, bool at_end)
 {
     on_buffer_change<UpdateInsert>(*this, begin, end, at_end, begin.line);
@@ -109,12 +132,58 @@ void SelectionList::update_erase(ByteCoord begin, ByteCoord end, bool at_end)
     on_buffer_change<UpdateErase>(*this, begin, end, at_end, end.line);
 }
 
+void SelectionList::update()
+{
+    for (auto& change : m_buffer->changes_since(m_timestamp))
+    {
+        if (change.type == Buffer::Change::Insert)
+            update_insert(change.begin, change.end, change.at_end);
+        else
+            update_erase(change.begin, change.end, change.at_end);
+    }
+    m_timestamp = m_buffer->timestamp();
+
+    check_invariant();
+}
+
 void SelectionList::check_invariant() const
 {
+#ifdef KAK_DEBUG
+    auto& buffer = this->buffer();
     kak_assert(size() > 0);
     kak_assert(m_main < size());
     for (size_t i = 0; i+1 < size(); ++ i)
         kak_assert((*this)[i].min() <= (*this)[i+1].min());
+
+    for (size_t i = 0; i < size(); ++i)
+    {
+        auto& sel = (*this)[i];
+        kak_assert(buffer.is_valid(sel.anchor()));
+        kak_assert(buffer.is_valid(sel.cursor()));
+        kak_assert(not buffer.is_end(sel.anchor()));
+        kak_assert(not buffer.is_end(sel.cursor()));
+        kak_assert(utf8::is_character_start(buffer.iterator_at(sel.anchor())));
+        kak_assert(utf8::is_character_start(buffer.iterator_at(sel.cursor())));
+    }
+#endif
+}
+
+void SelectionList::sort_and_merge_overlapping()
+{
+    if (size() == 1)
+        return;
+
+    const auto& main = this->main();
+    const auto main_begin = main.min();
+    m_main = std::count_if(begin(), end(), [&](const Selection& sel) {
+                               auto begin = sel.min();
+                               if (begin == main_begin)
+                                   return &sel < &main;
+                               else
+                                   return begin < main_begin;
+                           });
+    std::stable_sort(begin(), end(), compare_selections);
+    merge_overlapping(overlaps);
 }
 
 }
diff --git a/src/selection.hh b/src/selection.hh
index 016ce5f5..9b3f747a 100644
--- a/src/selection.hh
+++ b/src/selection.hh
@@ -12,7 +12,7 @@ using CaptureList = std::vector<String>;
 struct Selection
 {
     Selection() = default;
-    explicit Selection(ByteCoord pos) : Selection(pos,pos) {}
+    Selection(ByteCoord pos) : Selection(pos,pos) {}
     Selection(ByteCoord anchor, ByteCoord cursor,
               CaptureList captures = {})
         : m_anchor{anchor}, m_cursor{cursor},
@@ -57,13 +57,17 @@ static bool compare_selections(const Selection& lhs, const Selection& rhs)
 
 struct SelectionList
 {
-    SelectionList() = default;
-    SelectionList(ByteCoord c) : m_selections{Selection{c,c}} {}
-    SelectionList(Selection s) : m_selections{s} {}
+    SelectionList(const Buffer& buffer);
+    SelectionList(const Buffer& buffer, Selection s);
+    SelectionList(const Buffer& buffer, Selection s, size_t timestamp);
+    SelectionList(const Buffer& buffer, std::vector<Selection> s);
+    SelectionList(const Buffer& buffer, std::vector<Selection> s, size_t timestamp);
 
     void update_insert(ByteCoord begin, ByteCoord end, bool at_end);
     void update_erase(ByteCoord begin, ByteCoord end, bool at_end);
 
+    void update();
+
     void check_invariant() const;
 
     const Selection& main() const { return (*this)[m_main]; }
@@ -102,8 +106,8 @@ struct SelectionList
     size_t size() const { return m_selections.size(); }
     bool empty() const { return m_selections.empty(); }
 
-    bool operator==(const SelectionList& other) const { return m_selections == other.m_selections; }
-    bool operator!=(const SelectionList& other) const { return m_selections != other.m_selections; }
+    bool operator==(const SelectionList& other) const { return m_buffer == other.m_buffer and m_selections == other.m_selections; }
+    bool operator!=(const SelectionList& other) const { return !((*this) == other); }
 
     template<typename OverlapsFunc>
     void merge_overlapping(OverlapsFunc overlaps)
@@ -129,27 +133,19 @@ struct SelectionList
         kak_assert(std::is_sorted(begin(), end(), compare_selections));
     }
 
-    void sort_and_merge_overlapping()
-    {
-        if (size() == 1)
-            return;
+    void sort_and_merge_overlapping();
 
-        const auto& main = this->main();
-        const auto main_begin = main.min();
-        m_main = std::count_if(begin(), end(), [&](const Selection& sel) {
-                                   auto begin = sel.min();
-                                   if (begin == main_begin)
-                                       return &sel < &main;
-                                   else
-                                       return begin < main_begin;
-                               });
-        std::stable_sort(begin(), end(), compare_selections);
-        merge_overlapping(overlaps);
-    }
+    const Buffer& buffer() const { return *m_buffer; }
+
+    size_t timestamp() const { return m_timestamp; }
+    void set_timestamp(size_t timestamp) { m_timestamp = timestamp; }
 
 private:
     size_t m_main = 0;
     std::vector<Selection> m_selections;
+
+    safe_ptr<const Buffer> m_buffer;
+    size_t m_timestamp;
 };
 
 }
diff --git a/src/selectors.cc b/src/selectors.cc
index 5d98be52..40db98c9 100644
--- a/src/selectors.cc
+++ b/src/selectors.cc
@@ -431,13 +431,13 @@ Selection trim_partial_lines(const Buffer& buffer, const Selection& selection)
 
 void select_whole_buffer(const Buffer& buffer, SelectionList& selections)
 {
-    selections = SelectionList{ Selection({0,0}, buffer.back_coord()) };
+    selections = SelectionList{ buffer, Selection({0,0}, buffer.back_coord()) };
 }
 
 void select_all_matches(const Buffer& buffer, SelectionList& selections,
                         const Regex& regex)
 {
-    SelectionList result;
+    SelectionList result(buffer);
     for (auto& sel : selections)
     {
         auto sel_end = utf8::next(buffer.iterator_at(sel.max()));
@@ -470,7 +470,7 @@ void select_all_matches(const Buffer& buffer, SelectionList& selections,
 void split_selections(const Buffer& buffer, SelectionList& selections,
                       const Regex& regex)
 {
-    SelectionList result;
+    SelectionList result(buffer);
     for (auto& sel : selections)
     {
         auto begin = buffer.iterator_at(sel.min());
diff --git a/src/selectors.hh b/src/selectors.hh
index b28febef..d98b73bf 100644
--- a/src/selectors.hh
+++ b/src/selectors.hh
@@ -16,7 +16,7 @@ inline void clear_selections(const Buffer& buffer, SelectionList& selections)
     avoid_eol(buffer, pos);
     sel.anchor() = pos;
 
-    selections = SelectionList{ std::move(sel) };
+    selections = SelectionList{ buffer, std::move(sel) };
 }
 
 inline void flip_selections(SelectionList& selections)
@@ -31,7 +31,7 @@ inline void keep_selection(SelectionList& selections, int index)
     if (index < selections.size())
     {
         size_t real_index = (index + selections.main_index() + 1) % selections.size();
-        selections = SelectionList{ std::move(selections[real_index]) };
+        selections = SelectionList{ selections.buffer(), std::move(selections[real_index]) };
     }
     selections.check_invariant();
 }
diff --git a/src/window.cc b/src/window.cc
index 90c4ded6..fa6c9af9 100644
--- a/src/window.cc
+++ b/src/window.cc
@@ -23,7 +23,7 @@ Window::Window(Buffer& buffer)
       m_options(buffer.options()),
       m_keymaps(buffer.keymaps())
 {
-    InputHandler hook_handler{*m_buffer, { Selection{} } };
+    InputHandler hook_handler{{ *m_buffer, Selection{} }};
     hook_handler.context().set_window(*this);
     m_hooks.run_hook("WinCreate", buffer.name(), hook_handler.context());
     m_options.register_watcher(*this);
@@ -38,7 +38,7 @@ Window::Window(Buffer& buffer)
 
 Window::~Window()
 {
-    InputHandler hook_handler{*m_buffer, { Selection{} } };
+    InputHandler hook_handler{{ *m_buffer, Selection{} }};
     hook_handler.context().set_window(*this);
     m_hooks.run_hook("WinClose", buffer().name(), hook_handler.context());
     m_options.unregister_watcher(*this);
@@ -262,7 +262,7 @@ ByteCoord Window::offset_coord(ByteCoord coord, LineCount offset)
     lines.emplace_back(AtomList{ {buffer(), line, line+1} });
     display_buffer.compute_range();
 
-    InputHandler hook_handler{*m_buffer, { Selection{} } };
+    InputHandler hook_handler{{ *m_buffer, Selection{} } };
     hook_handler.context().set_window(*this);
     m_highlighters(hook_handler.context(), HighlightFlags::MoveOnly, display_buffer);
     m_builtin_highlighters(hook_handler.context(), HighlightFlags::MoveOnly, display_buffer);
@@ -274,7 +274,7 @@ ByteCoord Window::offset_coord(ByteCoord coord, LineCount offset)
 void Window::on_option_changed(const Option& option)
 {
     String desc = option.name() + "=" + option.get_as_string();
-    InputHandler hook_handler{*m_buffer, { Selection{} } };
+    InputHandler hook_handler{{ *m_buffer, Selection{} }};
     hook_handler.context().set_window(*this);
     m_hooks.run_hook("WinSetOption", desc, hook_handler.context());