diff --git a/src/buffer.cc b/src/buffer.cc
index c8853708..770be530 100644
--- a/src/buffer.cc
+++ b/src/buffer.cc
@@ -86,7 +86,7 @@ bool Buffer::set_name(String name)
     return false;
 }
 
-BufferIterator Buffer::iterator_at(const BufferCoord& coord) const
+BufferIterator Buffer::iterator_at(BufferCoord coord) const
 {
     return is_end(coord) ? end() : BufferIterator(*this, clamp(coord));
 }
@@ -126,7 +126,7 @@ LineCount Buffer::line_count() const
     return LineCount(m_lines.size());
 }
 
-String Buffer::string(const BufferCoord& begin, const BufferCoord& end) const
+String Buffer::string(BufferCoord begin, BufferCoord end) const
 {
     String res;
     for (auto line = begin.line; line <= end.line and line < line_count(); ++line)
@@ -187,7 +187,7 @@ class UndoGroupOptimizer
         return coord;
     }
 
-    static ByteCount count_byte_to(BufferCoord pos, const BufferCoord& endpos, const String& str)
+    static ByteCount count_byte_to(BufferCoord pos, BufferCoord endpos, const String& str)
     {
         ByteCount count = 0;
         for (auto it = str.begin(); it != str.end() and pos != endpos; ++it)
@@ -417,7 +417,7 @@ void Buffer::check_invariant() const
 #endif
 }
 
-BufferCoord Buffer::do_insert(const BufferCoord& pos, const String& content)
+BufferCoord Buffer::do_insert(BufferCoord pos, const String& content)
 {
     kak_assert(is_valid(pos));
 
@@ -497,7 +497,7 @@ BufferCoord Buffer::do_insert(const BufferCoord& pos, const String& content)
     return begin;
 }
 
-BufferCoord Buffer::do_erase(const BufferCoord& begin, const BufferCoord& end)
+BufferCoord Buffer::do_erase(BufferCoord begin, BufferCoord end)
 {
     kak_assert(is_valid(begin));
     kak_assert(is_valid(end));
@@ -531,7 +531,7 @@ BufferCoord Buffer::do_erase(const BufferCoord& begin, const BufferCoord& end)
 void Buffer::apply_modification(const Modification& modification)
 {
     const String& content = modification.content;
-    const BufferCoord& coord = modification.coord;
+    BufferCoord coord = modification.coord;
 
     kak_assert(is_valid(coord));
     // in modifications, end coords should be {line_count(), 0}
@@ -678,31 +678,31 @@ BufferCoord Buffer::char_prev(BufferCoord coord) const
     return coord;
 }
 
-ByteCount Buffer::distance(const BufferCoord& begin, const BufferCoord& end) const
+ByteCount Buffer::distance(BufferCoord begin, BufferCoord end) const
 {
     return offset(end) - offset(begin);
 }
 
-ByteCount Buffer::offset(const BufferCoord& c) const
+ByteCount Buffer::offset(BufferCoord c) const
 {
     if (c.line == line_count())
         return m_lines.back().start + m_lines.back().length();
     return m_lines[c.line].start + c.column;
 }
 
-bool Buffer::is_valid(const BufferCoord& c) const
+bool Buffer::is_valid(BufferCoord c) const
 {
    return (c.line < line_count() and c.column < m_lines[c.line].length()) or
           (c.line == line_count() - 1 and c.column == m_lines.back().length()) or
           (c.line == line_count() and c.column == 0);
 }
 
-bool Buffer::is_end(const BufferCoord& c) const
+bool Buffer::is_end(BufferCoord c) const
 {
     return c >= BufferCoord{line_count() - 1, m_lines.back().length()};
 }
 
-char Buffer::byte_at(const BufferCoord& c) const
+char Buffer::byte_at(BufferCoord c) const
 {
     kak_assert(c.line < line_count() and c.column < m_lines[c.line].length());
     return m_lines[c.line].content[c.column];
diff --git a/src/buffer.hh b/src/buffer.hh
index 61b9179e..0cc20fd0 100644
--- a/src/buffer.hh
+++ b/src/buffer.hh
@@ -69,8 +69,8 @@ private:
 class BufferChangeListener
 {
 public:
-    virtual void on_insert(const Buffer& buffer, const BufferCoord& begin, const BufferCoord& end) = 0;
-    virtual void on_erase(const Buffer& buffer, const BufferCoord& begin, const BufferCoord& end) = 0;
+    virtual void on_insert(const Buffer& buffer, BufferCoord begin, BufferCoord end) = 0;
+    virtual void on_erase(const Buffer& buffer, BufferCoord begin, BufferCoord end) = 0;
 };
 
 // A Buffer is a in-memory representation of a file
@@ -109,11 +109,11 @@ public:
     bool           undo();
     bool           redo();
 
-    String         string(const BufferCoord& begin, const BufferCoord& end) const;
+    String         string(BufferCoord begin, BufferCoord end) const;
 
-    char           byte_at(const BufferCoord& c) const;
-    ByteCount      offset(const BufferCoord& c) const;
-    ByteCount      distance(const BufferCoord& begin, const BufferCoord& end) const;
+    char           byte_at(BufferCoord c) const;
+    ByteCount      offset(BufferCoord c) const;
+    ByteCount      distance(BufferCoord begin, BufferCoord end) const;
     BufferCoord    advance(BufferCoord coord, ByteCount count) const;
     BufferCoord    next(BufferCoord coord) const;
     BufferCoord    prev(BufferCoord coord) const;
@@ -124,8 +124,8 @@ public:
     BufferCoord    back_coord() const { return { line_count() - 1, m_lines.back().length() - 1 }; }
     BufferCoord    end_coord() const { return { line_count() - 1, m_lines.back().length() }; }
 
-    bool           is_valid(const BufferCoord& c) const;
-    bool           is_end(const BufferCoord& c) const;
+    bool           is_valid(BufferCoord c) const;
+    bool           is_end(BufferCoord c) const;
 
     BufferIterator begin() const;
     BufferIterator end() const;
@@ -136,7 +136,7 @@ public:
     { return m_lines[line].content; }
 
     // returns an iterator at given coordinates. clamp line_and_column
-    BufferIterator iterator_at(const BufferCoord& coord) const;
+    BufferIterator iterator_at(BufferCoord coord) const;
 
     // returns nearest valid coordinates from given ones
     BufferCoord    clamp(BufferCoord coord) const;
@@ -177,8 +177,8 @@ private:
     };
     LineList m_lines;
 
-    BufferCoord do_insert(const BufferCoord& pos, const String& content);
-    BufferCoord do_erase(const BufferCoord& begin, const BufferCoord& end);
+    BufferCoord do_insert(BufferCoord pos, const String& content);
+    BufferCoord do_erase(BufferCoord begin, BufferCoord end);
 
     String  m_name;
     Flags   m_flags;
diff --git a/src/dynamic_selection_list.cc b/src/dynamic_selection_list.cc
index dfc78436..92a95d1c 100644
--- a/src/dynamic_selection_list.cc
+++ b/src/dynamic_selection_list.cc
@@ -36,12 +36,12 @@ void DynamicSelectionList::check_invariant() const
 #endif
 }
 
-void DynamicSelectionList::on_insert(const Buffer& buffer, const BufferCoord& begin, const BufferCoord& end)
+void DynamicSelectionList::on_insert(const Buffer& buffer, BufferCoord begin, BufferCoord end)
 {
     update_insert(buffer, begin, end);
 }
 
-void DynamicSelectionList::on_erase(const Buffer& buffer, const BufferCoord& begin, const BufferCoord& end)
+void DynamicSelectionList::on_erase(const Buffer& buffer, BufferCoord begin, BufferCoord end)
 {
     update_erase(buffer, begin, end);
 }
diff --git a/src/dynamic_selection_list.hh b/src/dynamic_selection_list.hh
index 7f8da0f0..fc90dcfd 100644
--- a/src/dynamic_selection_list.hh
+++ b/src/dynamic_selection_list.hh
@@ -19,8 +19,8 @@ public:
     void check_invariant() const;
 
 private:
-    void on_insert(const Buffer& buffer, const BufferCoord& begin, const BufferCoord& end) override;
-    void on_erase(const Buffer& buffer, const BufferCoord& begin, const BufferCoord& end) override;
+    void on_insert(const Buffer& buffer, BufferCoord begin, BufferCoord end) override;
+    void on_erase(const Buffer& buffer, BufferCoord begin, BufferCoord end) override;
 };
 
 }
diff --git a/src/editor.cc b/src/editor.cc
index 13253ae2..eed0fbe2 100644
--- a/src/editor.cc
+++ b/src/editor.cc
@@ -168,7 +168,7 @@ void sort_and_merge_overlapping(SelectionList& selections, size_t& main_selectio
     merge_overlapping(selections, main_selection, overlaps);
 }
 
-BufferCoord Editor::offset_coord(const BufferCoord& coord, CharCount offset)
+BufferCoord Editor::offset_coord(BufferCoord coord, CharCount offset)
 {
     auto& line = buffer()[coord.line];
     auto character = std::max(0_char, std::min(line.char_count_to(coord.column) + offset,
@@ -189,7 +189,7 @@ void Editor::move_selections(CharCount offset, SelectMode mode)
     sort_and_merge_overlapping(m_selections, m_main_sel);
 }
 
-BufferCoord Editor::offset_coord(const BufferCoord& coord, LineCount offset)
+BufferCoord Editor::offset_coord(BufferCoord coord, LineCount offset)
 {
     auto character = (*m_buffer)[coord.line].char_count_to(coord.column);
     auto line = clamp(coord.line + offset, 0_line, m_buffer->line_count()-1);
@@ -364,21 +364,21 @@ public:
     ModifiedRangesListener(Buffer& buffer)
         : BufferChangeListener_AutoRegister(buffer) {}
 
-    void on_insert(const Buffer& buffer, const BufferCoord& begin, const BufferCoord& end)
+    void on_insert(const Buffer& buffer, BufferCoord begin, BufferCoord end)
     {
         m_ranges.update_insert(buffer, begin, end);
         auto it = std::upper_bound(m_ranges.begin(), m_ranges.end(), begin,
-                                   [](const BufferCoord& c, const Selection& sel)
+                                   [](BufferCoord c, const Selection& sel)
                                    { return c < sel.min(); });
         m_ranges.emplace(it, begin, buffer.char_prev(end));
     }
 
-    void on_erase(const Buffer& buffer, const BufferCoord& begin, const BufferCoord& end)
+    void on_erase(const Buffer& buffer, BufferCoord begin, BufferCoord end)
     {
         m_ranges.update_erase(buffer, begin, end);
         auto pos = std::min(begin, buffer.back_coord());
         auto it = std::upper_bound(m_ranges.begin(), m_ranges.end(), pos,
-                                   [](const BufferCoord& c, const Selection& sel)
+                                   [](BufferCoord c, const Selection& sel)
                                    { return c < sel.min(); });
         m_ranges.emplace(it, pos, pos);
     }
diff --git a/src/editor.hh b/src/editor.hh
index 95ddd2b1..bf70af70 100644
--- a/src/editor.hh
+++ b/src/editor.hh
@@ -61,7 +61,7 @@ public:
     void flip_selections();
     void keep_selection(int index);
     void remove_selection(int index);
-    void select(const BufferCoord& c, SelectMode mode = SelectMode::Replace)
+    void select(BufferCoord c, SelectMode mode = SelectMode::Replace)
     { select(Selection{ buffer().clamp(c) }, mode); }
     void select(const Selection& sel,
                 SelectMode mode = SelectMode::Replace);
@@ -91,8 +91,8 @@ private:
     void begin_edition();
     void end_edition();
 
-    virtual BufferCoord offset_coord(const BufferCoord& coord, LineCount move);
-    virtual BufferCoord offset_coord(const BufferCoord& coord, CharCount move);
+    virtual BufferCoord offset_coord(BufferCoord coord, LineCount move);
+    virtual BufferCoord offset_coord(BufferCoord coord, CharCount move);
 
     int m_edition_level;
 
diff --git a/src/highlighters.cc b/src/highlighters.cc
index 1288f08f..940d4025 100644
--- a/src/highlighters.cc
+++ b/src/highlighters.cc
@@ -386,7 +386,7 @@ private:
             m_option->get<std::vector<LineAndFlag>>();
         }
 
-        void on_insert(const Buffer&, const BufferCoord& begin, const BufferCoord& end) override
+        void on_insert(const Buffer&, BufferCoord begin, BufferCoord end) override
         {
             LineCount new_lines = end.line - begin.line;
             if (new_lines == 0)
@@ -401,7 +401,7 @@ private:
             m_option->set(lines);
         }
 
-        void on_erase(const Buffer&, const BufferCoord& begin, const BufferCoord& end)  override
+        void on_erase(const Buffer&, BufferCoord begin, BufferCoord end)  override
         {
             LineCount removed_lines = end.line - begin.line;
             if (removed_lines == 0)
diff --git a/src/input_handler.cc b/src/input_handler.cc
index 1f947b66..997c6e96 100644
--- a/src/input_handler.cc
+++ b/src/input_handler.cc
@@ -497,7 +497,7 @@ struct BufferCompletion
 };
 
 static BufferCompletion complete_word(const Buffer& buffer,
-                                      const BufferCoord& cursor_pos,
+                                      BufferCoord cursor_pos,
                                       bool other_buffers)
 {
    auto pos = buffer.iterator_at(cursor_pos);
@@ -545,7 +545,7 @@ static BufferCompletion complete_word(const Buffer& buffer,
 }
 
 static BufferCompletion complete_opt(const Buffer& buffer,
-                                     const BufferCoord& cursor_pos,
+                                     BufferCoord cursor_pos,
                                      OptionManager& options)
 {
     using StringList = std::vector<String>;
diff --git a/src/line_and_column.hh b/src/line_and_column.hh
index 76d70a21..27ed61f0 100644
--- a/src/line_and_column.hh
+++ b/src/line_and_column.hh
@@ -13,60 +13,60 @@ struct LineAndColumn
     constexpr LineAndColumn(LineType line = 0, ColumnType column = 0)
         : line(line), column(column) {}
 
-    constexpr EffectiveType operator+(const EffectiveType& other) const
+    constexpr EffectiveType operator+(EffectiveType other) const
     {
         return EffectiveType(line + other.line, column + other.column);
     }
 
-    EffectiveType& operator+=(const EffectiveType& other)
+    EffectiveType& operator+=(EffectiveType other)
     {
         line   += other.line;
         column += other.column;
         return *static_cast<EffectiveType*>(this);
     }
 
-    constexpr EffectiveType operator-(const EffectiveType& other) const
+    constexpr EffectiveType operator-(EffectiveType other) const
     {
         return EffectiveType(line - other.line, column - other.column);
     }
 
-    EffectiveType& operator-=(const EffectiveType& other)
+    EffectiveType& operator-=(EffectiveType other)
     {
         line   -= other.line;
         column -= other.column;
         return *static_cast<EffectiveType*>(this);
     }
 
-    constexpr bool operator< (const EffectiveType& other) const
+    constexpr bool operator< (EffectiveType other) const
     {
         return (line != other.line) ? line < other.line
                                     : column < other.column;
     }
 
-    constexpr bool operator<= (const EffectiveType& other) const
+    constexpr bool operator<= (EffectiveType other) const
     {
         return (line != other.line) ? line < other.line
                                     : column <= other.column;
     }
 
-    constexpr bool operator> (const EffectiveType& other) const
+    constexpr bool operator> (EffectiveType other) const
     {
         return (line != other.line) ? line > other.line
                                     : column > other.column;
     }
 
-    constexpr bool operator>= (const EffectiveType& other) const
+    constexpr bool operator>= (EffectiveType other) const
     {
         return (line != other.line) ? line > other.line
                                     : column >= other.column;
     }
 
-    constexpr bool operator== (const EffectiveType& other) const
+    constexpr bool operator== (EffectiveType other) const
     {
         return line == other.line and column == other.column;
     }
 
-    constexpr bool operator!= (const EffectiveType& other) const
+    constexpr bool operator!= (EffectiveType other) const
     {
         return line != other.line or column != other.column;
     }
diff --git a/src/ncurses.cc b/src/ncurses.cc
index 0f084da0..80c3dcb0 100644
--- a/src/ncurses.cc
+++ b/src/ncurses.cc
@@ -510,8 +510,8 @@ static DisplayCoord compute_needed_size(const String& str)
     return res;
 }
 
-static DisplayCoord compute_pos(const DisplayCoord& anchor,
-                                const DisplayCoord& size,
+static DisplayCoord compute_pos(DisplayCoord anchor,
+                                DisplayCoord size,
                                 WINDOW* opt_window_to_avoid = nullptr)
 {
     DisplayCoord scrsize = window_size(stdscr);
diff --git a/src/normal.cc b/src/normal.cc
index f1e0cac2..50912251 100644
--- a/src/normal.cc
+++ b/src/normal.cc
@@ -723,7 +723,7 @@ void align(Context& context)
 {
     auto& selections = context.editor().selections();
     auto& buffer = context.buffer();
-    auto get_column = [&buffer](const BufferCoord& coord)
+    auto get_column = [&buffer](BufferCoord coord)
     { return buffer[coord.line].char_count_to(coord.column); };
 
     CharCount max_col = 0;
diff --git a/src/selection.cc b/src/selection.cc
index f7360e7f..a8ab889c 100644
--- a/src/selection.cc
+++ b/src/selection.cc
@@ -19,10 +19,10 @@ namespace
 
 template<template <bool, bool> class UpdateFunc>
 void on_buffer_change(const Buffer& buffer, SelectionList& sels,
-                      const BufferCoord& begin, const BufferCoord& end, LineCount end_line)
+                      BufferCoord begin, 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()) < c; });
+                                       [](const Selection& s, BufferCoord c) { return std::max(s.first(), s.last()) < 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; });
 
@@ -51,7 +51,7 @@ template<bool assume_different_line, bool assume_greater_than_begin>
 struct UpdateInsert
 {
     void operator()(const Buffer& buffer, BufferCoord& coord,
-                    const BufferCoord& begin, const BufferCoord& end) const
+                    BufferCoord begin, BufferCoord end) const
     {
         if (assume_different_line)
             kak_assert(begin.line < coord.line);
@@ -68,7 +68,7 @@ template<bool assume_different_line, bool assume_greater_than_begin>
 struct UpdateErase
 {
     void operator()(const Buffer& buffer, BufferCoord& coord,
-                    const BufferCoord& begin, const BufferCoord& end) const
+                    BufferCoord begin, BufferCoord end) const
     {
         if (not assume_greater_than_begin and coord < begin)
             return;
@@ -91,12 +91,12 @@ struct UpdateErase
 
 }
 
-void SelectionList::update_insert(const Buffer& buffer, const BufferCoord& begin, const BufferCoord& end)
+void SelectionList::update_insert(const Buffer& buffer, BufferCoord begin, BufferCoord end)
 {
     on_buffer_change<UpdateInsert>(buffer, *this, begin, end, begin.line);
 }
 
-void SelectionList::update_erase(const Buffer& buffer, const BufferCoord& begin, const BufferCoord& end)
+void SelectionList::update_erase(const Buffer& buffer, BufferCoord begin, BufferCoord end)
 {
     on_buffer_change<UpdateErase>(buffer, *this, begin, end, end.line);
 }
diff --git a/src/selection.hh b/src/selection.hh
index a95ee2aa..bb52602d 100644
--- a/src/selection.hh
+++ b/src/selection.hh
@@ -10,7 +10,7 @@ namespace Kakoune
 struct Range
 {
 public:
-    Range(const BufferCoord& first, const BufferCoord& last)
+    Range(BufferCoord first, BufferCoord last)
         : m_first{first}, m_last{last} {}
 
     void merge_with(const Range& range);
@@ -56,8 +56,8 @@ using CaptureList = std::vector<String>;
 // A selection is a Range, associated with a CaptureList
 struct Selection : public Range
 {
-    explicit Selection(const BufferCoord& pos) : Range(pos,pos) {}
-    Selection(const BufferCoord& first, const BufferCoord& last,
+    explicit Selection(BufferCoord pos) : Range(pos,pos) {}
+    Selection(BufferCoord first, BufferCoord last,
               CaptureList captures = {})
         : Range(first, last), m_captures(std::move(captures)) {}
 
@@ -76,8 +76,8 @@ struct SelectionList : std::vector<Selection>
     SelectionList() = default;
     SelectionList(Selection s) : std::vector<Selection>{s} {}
 
-    void update_insert(const Buffer& buffer, const BufferCoord& begin, const BufferCoord& end);
-    void update_erase(const Buffer& buffer, const BufferCoord& begin, const BufferCoord& end);
+    void update_insert(const Buffer& buffer, BufferCoord begin, BufferCoord end);
+    void update_erase(const Buffer& buffer, BufferCoord begin, BufferCoord end);
 
     void check_invariant() const;
 };
diff --git a/src/selectors.cc b/src/selectors.cc
index 63b17a06..f112a609 100644
--- a/src/selectors.cc
+++ b/src/selectors.cc
@@ -228,8 +228,8 @@ Selection select_matching(const Buffer& buffer, const Selection& selection)
 // c++14 will add std::optional, so we use boost::optional until then
 using boost::optional;
 static optional<Range> find_surrounding(const Buffer& buffer,
-                                        const BufferCoord& coord,
-                                        const CodepointPair& matching,
+                                        BufferCoord coord,
+                                        CodepointPair matching,
                                         ObjectFlags flags)
 {
     const bool to_begin = flags & ObjectFlags::ToBegin;
@@ -290,7 +290,7 @@ static optional<Range> find_surrounding(const Buffer& buffer,
 }
 
 Selection select_surrounding(const Buffer& buffer, const Selection& selection,
-                             const CodepointPair& matching,
+                             CodepointPair matching,
                              ObjectFlags flags)
 {
     auto res = find_surrounding(buffer, selection.last(), matching, flags);
diff --git a/src/selectors.hh b/src/selectors.hh
index a564eea7..79c62ebc 100644
--- a/src/selectors.hh
+++ b/src/selectors.hh
@@ -68,8 +68,7 @@ SelectionList split_selection(const Buffer& buffer, const Selection& selection,
 
 using CodepointPair = std::pair<Codepoint, Codepoint>;
 Selection select_surrounding(const Buffer& buffer, const Selection& selection,
-                             const CodepointPair& matching,
-                             ObjectFlags flags);
+                             CodepointPair matching, ObjectFlags flags);
 
 }
 
diff --git a/src/window.cc b/src/window.cc
index 59a93c51..c224595b 100644
--- a/src/window.cc
+++ b/src/window.cc
@@ -89,13 +89,13 @@ void Window::update_display_buffer()
     m_timestamp = buffer().timestamp();
 }
 
-void Window::set_position(const DisplayCoord& position)
+void Window::set_position(DisplayCoord position)
 {
     m_position.line = std::max(0_line, position.line);
     m_position.column = std::max(0_char, position.column);
 }
 
-void Window::set_dimensions(const DisplayCoord& dimensions)
+void Window::set_dimensions(DisplayCoord dimensions)
 {
     m_dimensions = dimensions;
 }
@@ -174,7 +174,7 @@ void Window::scroll_to_keep_cursor_visible_ifn()
 namespace
 {
 CharCount find_display_column(const DisplayLine& line, const Buffer& buffer,
-                              const BufferCoord& coord)
+                              BufferCoord coord)
 {
     CharCount column = 0;
     for (auto& atom : line)
@@ -212,7 +212,7 @@ BufferCoord find_buffer_coord(const DisplayLine& line, const Buffer& buffer,
 }
 }
 
-DisplayCoord Window::display_position(const BufferCoord& coord)
+DisplayCoord Window::display_position(BufferCoord coord)
 {
     LineCount l = 0;
     for (auto& line : m_display_buffer.lines())
@@ -225,7 +225,7 @@ DisplayCoord Window::display_position(const BufferCoord& coord)
     return { 0, 0 };
 }
 
-BufferCoord Window::offset_coord(const BufferCoord& coord, LineCount offset)
+BufferCoord Window::offset_coord(BufferCoord coord, LineCount offset)
 {
     auto line = clamp(coord.line + offset, 0_line, buffer().line_count()-1);
     DisplayBuffer display_buffer;
diff --git a/src/window.hh b/src/window.hh
index a9ea0c8c..534d18b3 100644
--- a/src/window.hh
+++ b/src/window.hh
@@ -25,10 +25,10 @@ public:
     ~Window();
 
     const DisplayCoord& position() const { return m_position; }
-    void set_position(const DisplayCoord& position);
+    void set_position(DisplayCoord position);
 
     const DisplayCoord& dimensions() const { return m_dimensions; }
-    void set_dimensions(const DisplayCoord& dimensions);
+    void set_dimensions(DisplayCoord dimensions);
 
     const DisplayBuffer& display_buffer() const { return m_display_buffer; }
 
@@ -38,7 +38,7 @@ public:
     void scroll(CharCount offset);
     void update_display_buffer();
 
-    DisplayCoord display_position(const BufferCoord& coord);
+    DisplayCoord display_position(BufferCoord coord);
 
     HighlighterGroup& highlighters() { return m_highlighters; }
 
@@ -57,7 +57,7 @@ private:
 
     void scroll_to_keep_cursor_visible_ifn();
 
-    BufferCoord offset_coord(const BufferCoord& coord, LineCount move) override;
+    BufferCoord offset_coord(BufferCoord coord, LineCount move) override;
 
     DisplayCoord  m_position;
     DisplayCoord  m_dimensions;