Ticket #33417: 33417.diff

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

@@ -2107 +2107 @@
                 },
 
                 /**
+                 * Prevent users from being able to skip cropping. Site Icons must always be cropped.
+                 *
+                 * @since 4.3.1
+                 */
+                mustBeCropped: function() {
+                        return true;
+                },
+
+                /**
                  * After an image is selected in the media modal, switch to the cropper
                  * state if the image isn't the right size.
                  */