opt: optimize border color set when change monitor

Author: DreamMaoMao

src/dispatch/bind_define.h

@@ -171,7 +171,7 @@ int toggle_trackpad_enable(const Arg *arg) {
 }
 
 int focusmon(const Arg *arg) {
-	Client *c = NULL, *old_selmon_sel = NULL;
+	Client *c = NULL;
 	Monitor *m = NULL;
 
 	if (arg->i != UNDIR) {
@@ -192,7 +192,6 @@ int focusmon(const Arg *arg) {
 	if (!m || !m->wlr_output->enabled || m == selmon)
 		return 0;
 
-	old_selmon_sel = selmon->sel;
 	selmon = m;
 	if (warpcursor) {
 		warp_cursor_to_selmon(selmon);
@@ -205,9 +204,6 @@ int focusmon(const Arg *arg) {
 	} else
 		focusclient(c, 1);
 
-	if (old_selmon_sel) {
-		client_set_unfocused_opacity_animation(old_selmon_sel);
-	}
 	return 0;
 }
 

src/mango.c

@@ -3166,6 +3166,7 @@ void destroykeyboardgroup(struct wl_listener *listener, void *data) {
 void focusclient(Client *c, int lift) {
 
 	Client *last_focus_client = NULL;
+	Monitor *um = NULL;
 
 	struct wlr_surface *old_keyboard_focus_surface =
 		seat->keyboard_state.focused_surface;
@@ -3211,6 +3212,13 @@ void focusclient(Client *c, int lift) {
 			client_set_unfocused_opacity_animation(last_focus_client);
 		}
 
+		wl_list_for_each(um, &mons, link) {
+			if (um->wlr_output->enabled && um != selmon && um->sel &&
+				!um->sel->iskilling) {
+				client_set_unfocused_opacity_animation(um->sel);
+			}
+		}
+
 		client_set_focused_opacity_animation(c);
 
 		// decide whether need to re-arrange