Customizer Theme Switcher: Don't deactivate section on empty search results.

props westonruter.
fixes #31889.

git-svn-id: https://develop.svn.wordpress.org/trunk@32083 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/js/customize-controls.js

@@ -584,6 +584,21 @@
 			});
 		},
 
+		/**
+		 * Override Section.isContextuallyActive method.
+		 *
+		 * Ignore the active states' of the contained theme controls, and just
+		 * use the section's own active state instead. This ensures empty search
+		 * results for themes to cause the section to become inactive.
+		 *
+		 * @since 4.2.0
+		 *
+		 * @returns {Boolean}
+		 */
+		isContextuallyActive: function () {
+			return this.active();
+		},
+
 		/**
 		 * @since 4.2.0
 		 */