FEATURE: Add hide button (toggleable) for all queries (frontend only)

* Switches between hide/unhide on click
* Works almost like the delete button, but toggles between the query's
hidden attribute instead
* So far this is only a frontend feature, the backend implementation
still needs work

assets/javascripts/discourse/controllers/admin-plugins-explorer.js.es6

@@ -236,6 +236,32 @@ export default Ember.Controller.extend({
         });
     },
 
+    hide() {
+      const query = this.selectedItem;
+      this.setProperties({ loading: true, showResults: false });
+
+      query.set("isNew", true);
+
+      this.store
+        .destroyRecord("query", query)
+        .then(() => query.set("hidden", true))
+        .catch(popupAjaxError)
+        .finally(() => {
+          query.set("isNew", false);
+          this.set("loading", false);
+        });
+    },
+
+    unhide() {
+      const query = this.selectedItem;
+      this.setProperties({ loading: true, showResults: true });
+      query
+        .save()
+        .then(() => query.set("hidden", false))
+        .catch(popupAjaxError)
+        .finally(() => this.set("loading", false));
+    },
+
     run() {
       if (this.get("selectedItem.dirty")) {
         return;

assets/javascripts/discourse/templates/admin/plugins-explorer.hbs

@@ -118,9 +118,14 @@
                 {{#if everEditing}}
                   {{d-button action=(action "discard") icon="undo" label="explorer.undo" disabled=saveDisabled}}
                 {{/if}}
-                {{#unless editDisabled}}
-                  {{d-button action=(action "destroy") class="btn-danger" icon="trash-alt" label="explorer.delete"}}
-                {{/unless}}
+                {{#if selectedItem.hidden}}
+                  {{d-button action=(action "unhide") icon="undo" label="explorer.unhide"}}
+                {{else}}
+                  {{d-button action=(action "hide") icon="far-eye-slash" label="explorer.hide"}}
+                  {{#unless editDisabled}}
+                    {{d-button action=(action "destroy") class="btn-danger" icon="trash-alt" label="explorer.delete"}}
+                  {{/unless}}
+                {{/if}}
               {{/if}}
             </div>
             <div class="clear"></div>

config/locales/client.en.yml

@@ -49,6 +49,8 @@ en:
       edit: "Edit"
       delete: "Delete"
       recover: "Undelete Query"
+      hide: "Hide"
+      unhide: "Unhide Query"
       download_json: "JSON"
       download_csv: "CSV"
       others_dirty: "A query has unsaved changes that will be lost if you navigate away."