Add `hasAppliedFilter` selector

Add selector to check if there are any applied filters on annotations

src/sidebar/store/modules/selection.js

@@ -519,6 +519,21 @@ function getSelectedAnnotationMap(state) {
   return state.selection.selectedAnnotationMap;
 }
 
+/**
+ * Is any sort of filtering currently applied to the list of annotations? This
+ * includes a search query, but also if annotations are selected or a user
+ * is focused.
+ *
+ * @return {boolean}
+ */
+const hasAppliedFilter = createSelector(
+  filterQuery,
+  focusModeFocused,
+  hasSelectedAnnotations,
+  (filterQuery, focusModeFocused, hasSelectedAnnotations) =>
+    !!filterQuery || focusModeFocused || hasSelectedAnnotations
+);
+
 export default {
   init: init,
   namespace: 'selection',
@@ -541,7 +556,6 @@ export default {
   },
 
   selectors: {
-    hasSelectedAnnotations,
     expandedThreads,
     filterQuery,
     focusModeFocused,
@@ -553,5 +567,7 @@ export default {
     isAnnotationSelected,
     getFirstSelectedAnnotationId,
     getSelectedAnnotationMap,
+    hasAppliedFilter,
+    hasSelectedAnnotations,
   },
 };

src/sidebar/store/modules/test/selection-test.js

@@ -62,6 +62,34 @@ describe('sidebar/store/modules/selection', () => {
     });
   });
 
+  describe('hasAppliedFilter', () => {
+    it('returns true if there is a search query set', () => {
+      store.setFilterQuery('foobar');
+
+      assert.isTrue(store.hasAppliedFilter());
+    });
+
+    it('returns true if in user-focused mode', () => {
+      store = createStore([selection], [{ focus: { user: {} } }]);
+      store.setFocusModeFocused(true);
+
+      assert.isTrue(store.hasAppliedFilter());
+    });
+
+    it('returns true if there are selected annotations', () => {
+      store.selectAnnotations([1]);
+
+      assert.isTrue(store.hasAppliedFilter());
+    });
+
+    it('returns false after selection is cleared', () => {
+      store.setFilterQuery('foobar');
+      store.clearSelection();
+
+      assert.isFalse(store.hasAppliedFilter());
+    });
+  });
+
   describe('hasSelectedAnnotations', function () {
     it('returns true if there are any selected annotations', function () {
       store.selectAnnotations([1]);