Convert window title to UCS-2 when updating it, don’t update it if it didn’t change

include/data.h

@@ -215,6 +215,7 @@ struct Client {
 
         /* Name (= window title) */
         char *name;
+        int name_len;
 
         /* fullscreen is pretty obvious */
         bool fullscreen;

src/handlers.c

@@ -495,8 +495,24 @@ int handle_windowname_change(void *data, xcb_connection_t *conn, uint8_t state,
                 return 1;
 
         /* Save the old pointer to make the update atomic */
+        char *new_name;
+        int new_len;
+        asprintf(&new_name, "%.*s", xcb_get_property_value_length(prop), (char*)xcb_get_property_value(prop));
+        /* Convert it to UCS-2 here for not having to convert it later every time we want to pass it to X */
+        char *ucs2_name = convert_utf8_to_ucs2(new_name, &new_len);
+        free(new_name);
+
+        /* Check if they are the same and don’t update if so */
+        if (new_len == client->name_len && strcmp(client->name, new_name) == 0) {
+                LOG("Name did not change, not updating\n");
+                free(ucs2_name);
+                return;
+        }
+
         char *old_name = client->name;
-        asprintf(&(client->name), "%.*s", xcb_get_property_value_length(prop), (char*)xcb_get_property_value(prop));
+        client->name = ucs2_name;
+        client->name_len = new_len;
+
         if (old_name != NULL)
                 free(old_name);
         LOG("rename to \"%s\".\n", client->name);

src/layout.c

@@ -169,11 +169,8 @@ void decorate_window(xcb_connection_t *conn, Client *client, xcb_drawable_t draw
                 uint32_t values[] = { text_color, background_color, font->id };
                 xcb_change_gc(conn, gc, mask, values);
 
-                int real_strlen;
+                xcb_image_text_16(conn, client->name_len, drawable, gc, 3 /* X */,
-                char *ucs2_label = convert_utf8_to_ucs2(client->name, &real_strlen);
+                                  offset + font->height /* Y = baseline of font */, (xcb_char2b_t*)client->name);
-                xcb_image_text_16(conn, real_strlen, drawable, gc, 3 /* X */,
-                                  offset + font->height /* Y = baseline of font */, (xcb_char2b_t*)ucs2_label);
-                free(ucs2_label);
         }
 }