Add an action to restore move-end behavior when extending selections

docs/changelog.rst

@@ -9,6 +9,10 @@ To update |kitty|, :doc:`follow the instructions <binary>`.
 
 - Add a new :ref:`action-toggle_layout` action to easily zoom/unzoom a window
 
+- When right clicking to extend a selection, move the nearest selection
+  boundary rather than the end of the selection. To restore previous behavior
+  use ``mouse_map right press ungrabbed mouse_selection move-end``.
+
 - Fix a bug in the implementation of the synchronized updates escape code that
   could cause incorrect parsing if either the pending buffer capacity or the
   pending timeout were exceeded (:iss:`3779`)

kitty/fast_data_types.pyi

@@ -17,6 +17,7 @@ MOUSE_SELECTION_NORMAL: int
 MOUSE_SELECTION_WORD: int
 MOUSE_SELECTION_RECTANGLE: int
 MOUSE_SELECTION_LINE_FROM_POINT: int
+MOUSE_SELECTION_MOVE_END: int
 KITTY_VCS_REV: str
 NO_CLOSE_REQUESTED: int
 IMPERATIVE_CLOSE_REQUESTED: int

kitty/mouse.c

@@ -281,11 +281,11 @@ drag_scroll(Window *w, OSWindow *frame) {
 }
 
 static inline void
-extend_selection(Window *w, bool ended) {
+extend_selection(Window *w, bool ended, bool extend_nearest) {
     Screen *screen = w->render_data.screen;
     if (screen_has_selection(screen)) {
         screen_update_selection(screen, w->mouse_pos.cell_x, w->mouse_pos.cell_y, w->mouse_pos.in_left_half_of_cell,
-                (SelectionUpdate){.ended=ended, .set_as_nearest_extend=true});
+                (SelectionUpdate){.ended=ended, .set_as_nearest_extend=extend_nearest});
     }
 }
 
@@ -590,6 +590,7 @@ typedef enum MouseSelectionType {
     MOUSE_SELECTION_WORD,
     MOUSE_SELECTION_LINE,
     MOUSE_SELECTION_LINE_FROM_POINT,
+    MOUSE_SELECTION_MOVE_END,
 } MouseSelectionType;
 
 
@@ -621,7 +622,10 @@ mouse_selection(Window *w, int code, int button) {
             if (screen_selection_range_for_line(screen, w->mouse_pos.cell_y, &start, &end) && end > w->mouse_pos.cell_x) S(EXTEND_LINE_FROM_POINT);
             break;
         case MOUSE_SELECTION_EXTEND:
-            extend_selection(w, false);
+            extend_selection(w, false, true);
+            break;
+        case MOUSE_SELECTION_MOVE_END:
+            extend_selection(w, false, false);
             break;
     }
     set_mouse_cursor_when_dragging();
@@ -863,6 +867,7 @@ init_mouse(PyObject *module) {
     PyModule_AddIntMacro(module, MOUSE_SELECTION_WORD);
     PyModule_AddIntMacro(module, MOUSE_SELECTION_LINE);
     PyModule_AddIntMacro(module, MOUSE_SELECTION_LINE_FROM_POINT);
+    PyModule_AddIntMacro(module, MOUSE_SELECTION_MOVE_END);
     if (PyModule_AddFunctions(module, module_methods) != 0) return false;
     return true;
 }

kitty/options/definition.py

@@ -548,6 +548,7 @@ mma('Select line from point',
 
 mma('Extend the current selection',
     'extend_selection right press ungrabbed mouse_selection extend',
+    long_text='If you want only the end of the selection to be moved instead of the nearest boundary, use move-end instead of extend.'
     )
 
 mma('Paste from the primary selection even when grabbed',

kitty/options/utils.py

@@ -341,6 +341,7 @@ def mouse_selection(func: str, rest: str) -> FuncArgsType:
         cmap = {
             'normal': defines.MOUSE_SELECTION_NORMAL,
             'extend': defines.MOUSE_SELECTION_EXTEND,
+            'move-end': defines.MOUSE_SELECTION_MOVE_END,
             'rectangle': defines.MOUSE_SELECTION_RECTANGLE,
             'word': defines.MOUSE_SELECTION_WORD,
             'line': defines.MOUSE_SELECTION_LINE,