Duplicate context menus when using custom context Menus in text controls

To reproduce:

1. Open e.g. texteditor example
2. Right click; our text editing context menu will be shown, but once it's closed, another native one will still be visible

Windows isn't affected as it opens context menus on release.

The workaround is to only open context menus on press on non-Windows systems:

    TapHandler {
        acceptedButtons: Qt.RightButton
        onPressedChanged: {
            if (pressed == (Application.styleHints.contextMenuTrigger === Qt.ContextMenuTrigger.Press))
                contextMenu.popup()
        }
    }

If you don't want to use ContextMenu at all, you can avoid this with the following code in e.g. TextArea and reuse that TextArea throughout the app:

ContextMenu.menu: null