Mark focused view focus_inactive on unfocused output

include/border.h

@@ -5,6 +5,7 @@
 
 void render_view_borders(wlc_handle view);
 void update_view_border(swayc_t *view);
+void map_update_view_border(swayc_t *view, void *data);
 int get_font_text_height(const char *font);
 
 #endif

sway/border.c

@@ -170,6 +170,12 @@ static void render_with_title_bar(swayc_t *view, cairo_t *cr, struct border_colo
 			view->actual_geometry.size.w, 1);
 }
 
+void map_update_view_border(swayc_t *view, void *data) {
+	if (view->type == C_VIEW) {
+		update_view_border(view);
+	}
+}
+
 void update_view_border(swayc_t *view) {
 	cairo_t *cr = NULL;
 	cairo_surface_t *surface = NULL;

sway/focus.c

@@ -29,6 +29,8 @@ static void update_focus(swayc_t *c) {
 
 		// Case where output changes
 		case C_OUTPUT:
+			// update borders for views in prev
+			container_map(prev, map_update_view_border, NULL);
 			wlc_output_focus(c->handle);
 			break;