When drag-scrolling stop the scroll when the mouse button is released.

docs/changelog.rst

@@ -19,6 +19,8 @@ Changelog
   nearest cell in the window. Avoids selection with the mouse failing when
   starting the selection just outside the window.
 
+- When drag-scrolling stop the scroll when the mouse button is released.
+
 
 0.11.2 [2018-07-01]
 ------------------------------

kitty/mouse.c

@@ -162,6 +162,7 @@ update_drag(bool from_button, Window *w, bool is_release, int modifiers) {
     if (from_button) {
         if (is_release) {
             global_state.active_drag_in_window = 0;
+            w->last_drag_scroll_at = 0;
             if (screen->selection.in_progress)
                 screen_update_selection(screen, w->mouse_cell_x, w->mouse_cell_y, true);
         }