Add an 'insert_hide_sel' option, which hides selection when inserting

src/highlighters.cc

@@ -259,20 +259,24 @@ void show_line_numbers(DisplayBuffer& display_buffer)
     }
 }
 
-void highlight_selections(const Editor& editor, DisplayBuffer& display_buffer)
+void highlight_selections(const Window& window, DisplayBuffer& display_buffer)
 {
-    for (size_t i = 0; i < editor.selections().size(); ++i)
+    const bool only_cursor = window.is_editing() and window.options()["insert_hide_sel"].get<bool>();
+    for (size_t i = 0; i < window.selections().size(); ++i)
     {
-        auto& sel = editor.selections()[i];
+        auto& sel = window.selections()[i];
         const bool forward = sel.first() <= sel.last();
         BufferIterator begin = forward ? sel.first() : utf8::next(sel.last());
         BufferIterator end   = forward ? sel.last() : utf8::next(sel.first());
 
-        const bool primary = (i == editor.main_selection_index());
+        const bool primary = (i == window.main_selection_index());
+        if (not only_cursor)
+        {
             ColorPair sel_colors = ColorRegistry::instance()[primary ? "PrimarySelection" : "SecondarySelection"];
-        ColorPair cur_colors = ColorRegistry::instance()[primary ? "PrimaryCursor" : "SecondaryCursor"];
             highlight_range(display_buffer, begin, end, false,
                             [&](DisplayAtom& atom) { atom.colors = sel_colors; });
+        }
+        ColorPair cur_colors = ColorRegistry::instance()[primary ? "PrimaryCursor" : "SecondaryCursor"];
         highlight_range(display_buffer, sel.last(), utf8::next(sel.last()), false,
                         [&](DisplayAtom& atom) { atom.colors = cur_colors; });
     }

src/option_manager.cc

@@ -260,6 +260,7 @@ GlobalOptions::GlobalOptions()
     declare_option<String>("filetype", "");
     declare_option<std::vector<String>>("completions", {});
     declare_option<std::vector<String>>("path", { "./", "/usr/include" });
+    declare_option<bool>("insert_hide_sel", false);
 }
 
 template<typename T>

src/window.cc

@@ -12,7 +12,7 @@ namespace Kakoune
 {
 
 // Implementation in highlighters.cc
-void highlight_selections(const Editor& editor, DisplayBuffer& display_buffer);
+void highlight_selections(const Window& window, DisplayBuffer& display_buffer);
 void expand_tabulations(const OptionManager& options, DisplayBuffer& display_buffer);
 void expand_unprintable(DisplayBuffer& display_buffer);