Fix command menu when used with an IME

The Enter key is used both to confirm a selection in an IME
but also to confirm a selection in the command menu. We need
to distinguish this to not confirm both selections on the
same Enter keyboard event.

Fixed: 370332848
Change-Id: Ic0b09f8bc3b334e74c6049050edf7981776694d3
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6054256
Auto-Submit: Yang Guo <yangguo@chromium.org>
Reviewed-by: Nancy Li <nancyly@chromium.org>
Commit-Queue: Nancy Li <nancyly@chromium.org>

Author: hashseed

front_end/ui/legacy/components/quick_open/FilteredListWidget.ts

@@ -534,7 +534,9 @@ export class FilteredListWidget extends Common.ObjectWrapper.eventMixin<EventTyp
     let handled = false;
     switch (keyboardEvent.key) {
       case Platform.KeyboardUtilities.ENTER_KEY:
-        this.onEnter(keyboardEvent);
+        if (!keyboardEvent.isComposing) {  // Ignore ENTER to confirm selection in an IME
+          this.onEnter(keyboardEvent);
+        }
         return;
       case Platform.KeyboardUtilities.TAB_KEY:
         if (keyboardEvent.shiftKey) {