diff --git a/src/dynamic_selection_list.cc b/src/dynamic_selection_list.cc
index 1490dd9c..e6e32f6d 100644
--- a/src/dynamic_selection_list.cc
+++ b/src/dynamic_selection_list.cc
@@ -30,94 +30,14 @@ void DynamicSelectionList::check_invariant() const
 #endif
 }
 
-namespace
-{
-
-template<template <bool, bool> class UpdateFunc>
-void on_buffer_change(SelectionList& sels, const BufferCoord& begin, const BufferCoord& end, LineCount end_line)
-{
-    auto update_beg = std::lower_bound(sels.begin(), sels.end(), begin,
-                                       [](const Selection& s, const BufferCoord& c) { return std::max(s.first(), s.last()).coord() < c; });
-    auto update_only_line_beg = std::upper_bound(sels.begin(), sels.end(), end_line,
-                                                 [](LineCount l, const Selection& s) { return l < std::min(s.first(), s.last()).line(); });
-
-    if (update_beg != update_only_line_beg)
-    {
-        // for the first one, we are not sure if min < begin
-        UpdateFunc<false, false>{}(update_beg->first(), begin, end);
-        UpdateFunc<false, false>{}(update_beg->last(), begin, end);
-    }
-    for (auto it = update_beg+1; it < update_only_line_beg; ++it)
-    {
-        UpdateFunc<false, true>{}(it->first(), begin, end);
-        UpdateFunc<false, true>{}(it->last(), begin, end);
-    }
-    if (end.line > begin.line)
-    {
-        for (auto it = update_only_line_beg; it != sels.end(); ++it)
-        {
-            UpdateFunc<true, true>{}(it->first(), begin, end);
-            UpdateFunc<true, true>{}(it->last(), begin, end);
-        }
-    }
-}
-
-template<bool assume_different_line, bool assume_greater_than_begin>
-struct UpdateInsert
-{
-    void operator()(BufferIterator& it,
-                    const BufferCoord& begin, const BufferCoord& end) const
-    {
-        BufferCoord coord = it.coord();
-        if (assume_different_line)
-            kak_assert(begin.line < coord.line);
-        if (not assume_greater_than_begin and coord < begin)
-            return;
-        if (not assume_different_line and begin.line == coord.line)
-            coord.column = end.column + coord.column - begin.column;
-
-        coord.line += end.line - begin.line;
-        it = coord;
-    }
-};
-
-template<bool assume_different_line, bool assume_greater_than_begin>
-struct UpdateErase
-{
-    void operator()(BufferIterator& it,
-                    const BufferCoord& begin, const BufferCoord& end) const
-    {
-        BufferCoord coord = it.coord();
-        if (not assume_greater_than_begin and coord < begin)
-            return;
-        if (assume_different_line)
-            kak_assert(end.line < coord.line);
-        if (not assume_different_line and coord <= end)
-            coord = it.buffer().clamp(begin);
-        else
-        {
-            if (not assume_different_line and end.line == coord.line)
-            {
-                coord.line = begin.line;
-                coord.column = begin.column + coord.column - end.column;
-            }
-            else
-                coord.line -= end.line - begin.line;
-        }
-        it = coord;
-    }
-};
-
-}
-
 void DynamicSelectionList::on_insert(const BufferIterator& begin, const BufferIterator& end)
 {
-    on_buffer_change<UpdateInsert>(*this, begin.coord(), end.coord(), begin.line());
+    update_insert(begin.coord(), end.coord());
 }
 
 void DynamicSelectionList::on_erase(const BufferIterator& begin, const BufferIterator& end)
 {
-    on_buffer_change<UpdateErase>(*this, begin.coord(), end.coord(), end.line());
+    update_erase(begin.coord(), end.coord());
 }
 
 }
diff --git a/src/selection.cc b/src/selection.cc
index 065aaefc..0e6bd710 100644
--- a/src/selection.cc
+++ b/src/selection.cc
@@ -52,4 +52,94 @@ void Selection::avoid_eol()
     Kakoune::avoid_eol(last());
 }
 
+namespace
+{
+
+template<template <bool, bool> class UpdateFunc>
+void on_buffer_change(SelectionList& sels, const BufferCoord& begin, const BufferCoord& end, LineCount end_line)
+{
+    auto update_beg = std::lower_bound(sels.begin(), sels.end(), begin,
+                                       [](const Selection& s, const BufferCoord& c) { return std::max(s.first(), s.last()).coord() < c; });
+    auto update_only_line_beg = std::upper_bound(sels.begin(), sels.end(), end_line,
+                                                 [](LineCount l, const Selection& s) { return l < std::min(s.first(), s.last()).line(); });
+
+    if (update_beg != update_only_line_beg)
+    {
+        // for the first one, we are not sure if min < begin
+        UpdateFunc<false, false>{}(update_beg->first(), begin, end);
+        UpdateFunc<false, false>{}(update_beg->last(), begin, end);
+    }
+    for (auto it = update_beg+1; it < update_only_line_beg; ++it)
+    {
+        UpdateFunc<false, true>{}(it->first(), begin, end);
+        UpdateFunc<false, true>{}(it->last(), begin, end);
+    }
+    if (end.line > begin.line)
+    {
+        for (auto it = update_only_line_beg; it != sels.end(); ++it)
+        {
+            UpdateFunc<true, true>{}(it->first(), begin, end);
+            UpdateFunc<true, true>{}(it->last(), begin, end);
+        }
+    }
+}
+
+template<bool assume_different_line, bool assume_greater_than_begin>
+struct UpdateInsert
+{
+    void operator()(BufferIterator& it,
+                    const BufferCoord& begin, const BufferCoord& end) const
+    {
+        BufferCoord coord = it.coord();
+        if (assume_different_line)
+            kak_assert(begin.line < coord.line);
+        if (not assume_greater_than_begin and coord < begin)
+            return;
+        if (not assume_different_line and begin.line == coord.line)
+            coord.column = end.column + coord.column - begin.column;
+
+        coord.line += end.line - begin.line;
+        it = coord;
+    }
+};
+
+template<bool assume_different_line, bool assume_greater_than_begin>
+struct UpdateErase
+{
+    void operator()(BufferIterator& it,
+                    const BufferCoord& begin, const BufferCoord& end) const
+    {
+        BufferCoord coord = it.coord();
+        if (not assume_greater_than_begin and coord < begin)
+            return;
+        if (assume_different_line)
+            kak_assert(end.line < coord.line);
+        if (not assume_different_line and coord <= end)
+            coord = it.buffer().clamp(begin);
+        else
+        {
+            if (not assume_different_line and end.line == coord.line)
+            {
+                coord.line = begin.line;
+                coord.column = begin.column + coord.column - end.column;
+            }
+            else
+                coord.line -= end.line - begin.line;
+        }
+        it = coord;
+    }
+};
+
+}
+
+void SelectionList::update_insert(const BufferCoord& begin, const BufferCoord& end)
+{
+    on_buffer_change<UpdateInsert>(*this, begin, end, begin.line);
+}
+
+void SelectionList::update_erase(const BufferCoord& begin, const BufferCoord& end)
+{
+    on_buffer_change<UpdateErase>(*this, begin, end, end.line);
+}
+
 }
diff --git a/src/selection.hh b/src/selection.hh
index 2faf61e5..50b8ad7c 100644
--- a/src/selection.hh
+++ b/src/selection.hh
@@ -67,7 +67,14 @@ private:
 
     CaptureList m_captures;
 };
-using SelectionList = std::vector<Selection>;
+
+struct SelectionList : std::vector<Selection>
+{
+    using std::vector<Selection>::vector;
+
+    void update_insert(const BufferCoord& begin, const BufferCoord& end);
+    void update_erase(const BufferCoord& begin, const BufferCoord& end);
+};
 
 }