winwidget_resize: Only use netwm-fullscreen patch for fullscreen windows

src/winwidget.c

@@ -758,6 +758,10 @@ void winwidget_move(winwidget winwid, int x, int y)
 
 void winwidget_resize(winwidget winwid, int w, int h)
 {
+	Window ignored_window;
+	XWindowAttributes attributes;
+	int tc_x, tc_y;
+
 	if (opt.geom_flags) {
 		winwid->had_resize = 1;
 		return;
@@ -769,7 +773,18 @@ void winwidget_resize(winwidget winwid, int w, int h)
 			winwid->w = (w > scr->width) ? scr->width : w;
 			winwid->h = (h > scr->height) ? scr->height : h;
 		}
-		XResizeWindow(disp, winwid->win, winwid->w, winwid->h);
+		if (winwid->fullscreen) {
+			XGetWindowAttributes(disp, winwid->win, &attributes);
+			XTranslateCoordinates(disp, winwid->win, attributes.root,
+						-attributes.border_width -
+						attributes.x,
+						-attributes.border_width - attributes.y, &tc_x, &tc_y, &ignored_window);
+			winwid->x = tc_x;
+			winwid->y = tc_y;
+			XMoveResizeWindow(disp, winwid->win, tc_x, tc_y, winwid->w, winwid->h);
+		} else
+			XResizeWindow(disp, winwid->win, winwid->w, winwid->h);
+
 		winwid->had_resize = 1;
 		XFlush(disp);