opt: disable some action in overview

src/mango.c

@@ -893,6 +893,10 @@ void clear_fullscreen_flag(Client *c) {
 }
 
 void minimized(const Arg *arg) {
+
+	if (selmon && selmon->isoverview)
+		return;
+
 	if (selmon->sel && !selmon->sel->isminied) {
 		set_minimized(selmon->sel);
 	}