Long-press (but not right-click) leads to doubled-up context menus in QWebEngineView

Steps to reproduce

1. Build and run the WebEngine Widgets Simple Browser Example on a device with a touchscreen
2. Long-press on some text to bring up the simplified context menu
3. Tap on the "..." menu item to bring up the full context menu
4. Dismiss the context menus, then right click the same text to bring up the context menu

Outcomes

(Step #2) We get a funny-looking context menu:

(Step #3) We get two copies of the context menu: One at the location of the long-press, and one at the top-left corner of the QWebEngineView

(Step #4) We don't see the funny context menu from Step #2. We only get a single copy of the same context menu as Step #3

Notes

• Does not reproduce on the WebEngine Quick Nano Browser Example – both right-click and long-press generates the same context menu
• Does not reproduce on Linux (either Boot to Qt + eglfs or Ubuntu 22.04 + xcb-XWayland): Long-pressing leads to the expected context menu is seen without duplication