feat: Prevent rebuilding workspaces when customizing items, b=(no-bug), c=workspaces

src/zen/workspaces/ZenWorkspace.mjs

@@ -37,10 +37,13 @@
     }
 
     connectedCallback() {
-      if (this.delayConnectedCallback()) {
+      if (this.delayConnectedCallback() || this._hasConnected) {
+        // If we are not ready yet, or if we have already connected, we
+        // don't need to do anything.
         return;
       }
 
+      this._hasConnected = true;
       this.appendChild(this.constructor.fragment);
 
       this.tabsContainer = this.querySelector('.zen-workspace-normal-tabs-section');

src/zen/workspaces/ZenWorkspaceIcons.mjs

@@ -5,10 +5,11 @@
     }
 
     connectedCallback() {
-      if (this.delayConnectedCallback()) {
+      if (this.delayConnectedCallback() || this._hasConnected) {
         return;
       }
 
+      this._hasConnected = true;
       window.addEventListener('ZenWorkspacesUIUpdate', this, true);
     }
 

surfer.json

@@ -19,7 +19,7 @@
       "brandShortName": "Zen",
       "brandFullName": "Zen Browser",
       "release": {
-        "displayVersion": "1.12.6b",
+        "displayVersion": "1.12.7b",
         "github": {
           "repo": "zen-browser/desktop"
         },