Window titlebar double click to unmaximize

Commit 6e2075f3df from 2020 added
a feature to maximize window when double clicking on the titlebar.
But unmaximizing is not supported so when double clicking again
on the window titlebar the window geometry was not reverted back.

src/window.c

@@ -2913,17 +2913,18 @@ static void titlebarDblClick(WCoreWindow *sender, void *data, XEvent *event)
 			} 
 		}
 		
-		if (wPreferences.double_click_fullscreen){
+		if (wPreferences.double_click_fullscreen) {
 			int dir = 0;
+
 			if (event->xbutton.state == 0) {
 				/* maximize window full screen*/
 				dir |= (MAX_VERTICAL|MAX_HORIZONTAL);
 				int ndir = dir ^ wwin->flags.maximized;
+				if (ndir != 0)
 					wMaximizeWindow(wwin, ndir, wGetHeadForWindow(wwin));
-			
-			} 
-
-					
+				else
+					wUnmaximizeWindow(wwin);
+			}
 		} else {
 			int dir = 0;