[mutter] window: Maximize tiled windows when resizing to work area

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

commit 57e58eaf2a5e9d5ba7a4f2e232988c6ebc8408f9
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Sun Jun 11 14:58:21 2017 -0300

    window: Maximize tiled windows when resizing to work area
    
    Now that tiled windows are resizable, the user may grow a tiled
    windows until it covers the entire work area. As this makes the
    window state mostly indistinguishable from maximization, avoid
    subtle differences by properly maximizing the window in that case.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=645153

 src/core/window.c |   19 +++++++++++++++++++
 1 files changed, 19 insertions(+), 0 deletions(-)
---
diff --git a/src/core/window.c b/src/core/window.c
index 09f6fd3..9aa962c 100644
--- a/src/core/window.c
+++ b/src/core/window.c
@@ -6147,6 +6147,24 @@ update_resize (MetaWindow *window,
     g_get_current_time (&window->display->grab_last_moveresize_time);
 }
 
+static void
+maybe_maximize_tiled_window (MetaWindow *window)
+{
+  MetaRectangle work_area;
+  gint shake_threshold;
+
+  if (!META_WINDOW_TILED_SIDE_BY_SIDE (window))
+    return;
+
+  shake_threshold = meta_prefs_get_drag_threshold ();
+
+  meta_window_get_work_area_for_monitor (window,
+                                         window->tile_monitor_number,
+                                         &work_area);
+  if (window->rect.width >= work_area.width - shake_threshold)
+    meta_window_maximize (window, META_MAXIMIZE_BOTH);
+}
+
 void
 meta_window_update_resize (MetaWindow *window,
                            gboolean    snap,
@@ -6190,6 +6208,7 @@ end_grab_op (MetaWindow *window,
                          modifiers & CLUTTER_SHIFT_MASK,
                          x, y,
                          TRUE);
+          maybe_maximize_tiled_window (window);
         }
     }
   window->screen->preview_tile_mode = META_TILE_NONE;