Alt-Space permits to remove a selection by index

src/editor.cc

@@ -136,6 +136,14 @@ void Editor::keep_selection(int index)
     }
 }
 
+void Editor::remove_selection(int index)
+{
+    check_invariant();
+
+    if (selections().size() > 1 and index < selections().size())
+        m_selections.back().erase(m_selections.back().begin() + index);
+}
+
 void Editor::select(const BufferIterator& iterator)
 {
     m_selections.back().clear();

src/editor.hh

@@ -43,6 +43,7 @@ public:
     void move_selections(const BufferCoord& offset, bool append = false);
     void clear_selections();
     void keep_selection(int index);
+    void remove_selection(int index);
     void select(const BufferIterator& iterator);
     void select(const Selector& selector, bool append = false);
     void multi_select(const MultiSelector& selector);

src/main.cc

@@ -388,6 +388,8 @@ std::unordered_map<Key, std::function<void (Editor& editor, int count)>> keymap
     { { Key::Modifiers::None, '|' }, do_pipe },
     { { Key::Modifiers::None, ' ' }, [](Editor& editor, int count) { if (count == 0) editor.clear_selections();
                                                                      else editor.keep_selection(count-1); } },
+    { { Key::Modifiers::Alt,  ' ' }, [](Editor& editor, int count) { if (count == 0) editor.clear_selections();
+                                                                     else editor.remove_selection(count-1); } },
     { { Key::Modifiers::None, 'w' }, [](Editor& editor, int count) { do { editor.select(select_to_next_word<false>); } while(--count > 0); } },
     { { Key::Modifiers::None, 'e' }, [](Editor& editor, int count) { do { editor.select(select_to_next_word_end<false>); } while(--count > 0); } },
     { { Key::Modifiers::None, 'b' }, [](Editor& editor, int count) { do { editor.select(select_to_previous_word<false>); } while(--count > 0); } },