Update UrlbarInput to conditionally disable preventClickSelectsAll based on breakout-extend attribute

Author: mr-cheffy

src/browser/components/urlbar/UrlbarInput-sys-mjs.patch

@@ -1,5 +1,5 @@
 diff --git a/browser/components/urlbar/UrlbarInput.sys.mjs b/browser/components/urlbar/UrlbarInput.sys.mjs
-index c504c9afc43785b5f003bb1f9f1dfbddef38d78b..63a2527725849c5f378fe71d2300a99f9b47b576 100644
+index c504c9afc43785b5f003bb1f9f1dfbddef38d78b..e5a1ce5d61962d485d092cf3d1a90ff4833037f1 100644
 --- a/browser/components/urlbar/UrlbarInput.sys.mjs
 +++ b/browser/components/urlbar/UrlbarInput.sys.mjs
 @@ -3901,6 +3901,9 @@ export class UrlbarInput {
@@ -30,7 +30,7 @@ index c504c9afc43785b5f003bb1f9f1dfbddef38d78b..63a2527725849c5f378fe71d2300a99f
 
          this.focusedViaMousedown = !this.focused;
 -        this._preventClickSelectsAll = this.focused;
-+        this._preventClickSelectsAll = false;
++        this._preventClickSelectsAll = this.hasAttribute("breakout-extend");
 
          // Keep the focus status, since the attribute may be changed
          // upon calling this.focus().