Fixed a bug where images would duplicate when closing dialog with escape key.

front_end/static/js/popup.js

@@ -38,3 +38,18 @@ function createNewTabLink(imageUrl) {
     button.classList.add('dialog-button');
     return button;
 }
+
+document.onkeydown = function(evt) {
+    evt = evt || window.event;
+    var isEscape = false;
+    if ("key" in evt) {
+        isEscape = (evt.key === "Escape" || evt.key === "Esc");
+    } else {
+        isEscape = (evt.keyCode === 27);
+    }
+    if (isEscape) {
+        while (dialog.hasChildNodes()) {
+            dialog.removeChild(dialog.firstChild);
+        }
+    }
+};
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