[gnome-todo] list-selector-grid-item: Allow control-click for selection mode.

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 4d7c2979fcc92c865d28f81fc32081350965b3ca
Author: Linus Probert <linus probert gmail com>
Date:   Fri Apr 28 00:33:29 2017 +0200

    list-selector-grid-item: Allow control-click for selection mode.
    
    Currently entering selection mode is possible through clicking the 'selection
    mode' button or by right-clicking a grid item.
    
    According to the style guide it's recomended to enable selection mode by
    control/shift-clicking an item.
    
    To remedy this we now allow ctrl-left-click on grid items to enter
    selection mode and mark them as selected.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=778675

 src/views/gtd-list-selector-grid-item.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)
---
diff --git a/src/views/gtd-list-selector-grid-item.c b/src/views/gtd-list-selector-grid-item.c
index 6147e09..5e0ab02 100644
--- a/src/views/gtd-list-selector-grid-item.c
+++ b/src/views/gtd-list-selector-grid-item.c
@@ -340,11 +340,16 @@ gtd_list_selector_grid_item__button_press_event_cb (GtkWidget *widget,
 {
   GtdListSelectorGridItem *item;
   GdkEventButton *button_ev;
+  gboolean right_click;
+  gboolean left_click_with_ctrl;
 
   item = GTD_LIST_SELECTOR_GRID_ITEM (user_data);
   button_ev = (GdkEventButton*) event;
 
-  if (button_ev->button == 3)
+  right_click = button_ev->button == 3;
+  left_click_with_ctrl = button_ev->button == 1 && button_ev->state & GDK_CONTROL_MASK;
+
+  if (right_click || left_click_with_ctrl)
     {
       if (item->mode == GTD_WINDOW_MODE_NORMAL)
         {