window: Track window rectangle before corner tiling

When corner-tiling a maximized window, we should keep track of the saved
rectangle so that tiling does not reset our window size. Otherwise,
untiling the previously maximized window will end up with an unmaximized
full-size window, rather than the original window size.

src/core/window.c

@@ -2497,8 +2497,10 @@ ensure_size_hints_satisfied (MetaRectangle    *rect,
 static void
 meta_window_save_rect (MetaWindow *window)
 {
-  if (!(META_WINDOW_MAXIMIZED (window) || META_WINDOW_SIDE_TILED (window) ||
-        META_WINDOW_CORNER_TILED(window) || window->fullscreen))
+  if (!(META_WINDOW_MAXIMIZED (window) ||
+        META_WINDOW_SIDE_TILED (window) ||
+        META_WINDOW_CORNER_TILED(window) ||
+        window->fullscreen))
     {
       /* save size/pos as appropriate args for move_resize */
       if (!window->maximized_horizontally)
@@ -2698,14 +2700,24 @@ meta_window_tile (MetaWindow *window)
   if (window->tile_mode == META_TILE_NONE)
     return;
 
-  if(window->tile_mode == META_TILE_LEFT || window->tile_mode == META_TILE_RIGHT)
+  if (window->tile_mode == META_TILE_LEFT ||
+      window->tile_mode == META_TILE_RIGHT)
     {
       MetaRectangle *saved_rect = NULL;
       saved_rect = &window->saved_rect;
       meta_window_maximize_internal (window, META_MAXIMIZE_VERTICAL, saved_rect);
     }
+  else if (window->tile_mode == META_TILE_BOTTOM_RIGHT ||
+           window->tile_mode == META_TILE_BOTTOM_LEFT ||
+           window->tile_mode == META_TILE_TOP_RIGHT ||
+           window->tile_mode == META_TILE_TOP_LEFT)
+    {
+      MetaRectangle *saved_rect = NULL;
+      saved_rect = &window->saved_rect;
+      meta_window_maximize_internal (window, META_MAXIMIZE_HORIZONTAL, saved_rect);
+    }
   else
-    meta_window_save_rect(window);
+    meta_window_save_rect (window);
 
   window->tiled = TRUE;
   /* move_resize with new tiling constraints