Resolved conflict cherry-picking https://github.com/weseek/growi/pull/6562/commits/23d5919145659378b7007f48f5d68a982d2938a5

packages/app/src/components/PageEditor/CodeMirrorEditor.jsx

@@ -587,7 +587,7 @@ class CodeMirrorEditor extends AbstractEditor {
   }
 
   keyUpHandler(editor, event) {
-    if (event.key !== 'Backspace') {
+    if (event.key === ':') {
       this.checkWhetherEmojiPickerShouldBeShown();
     }
   }