Add double-clicking support to FLD elements

Resolves #11277

CHANGELOG-WIP.md

@@ -21,6 +21,7 @@
 - Selectize options can now specify searchable `keywords` that won’t be visible in the UI.
 - Selectize inputs will now include their options’ values as search keywords.
 - Newly-created entries now get placeholder Post Date set on them, so they get sorted appropriately when querying for entries ordered by `postDate`. ([#11272](https://github.com/craftcms/cms/issues/11272)) 
+- Field layout elements within field layout designers now support double-clicking to open their settings slideout. ([#11277](https://github.com/craftcms/cms/discussions/11277))
 - The `users/create` command now asks whether the user should be activated when saved.
 - Deprecation messages are now consistently referred to as “deprecation warnings” in the control panel.
 

src/web/assets/cp/src/js/FieldLayoutDesigner.js

@@ -608,13 +608,16 @@ Craft.FieldLayoutDesigner.Element = Garnish.Base.extend({
         title: Craft.t('app', 'Edit'),
       });
 
-      this.$editBtn.on('click', () => {
+      const showSettings = () => {
         if (!this.slideout) {
           this.createSettings(settingsHtml, isRequired);
         } else {
           this.slideout.open();
         }
-      });
+      };
+
+      this.$editBtn.on('click', showSettings);
+      this.$container.on('dblclick', showSettings);
     }
 
     this.initUi();