TextFieldContextMenu: Open menu by keyPressed at TextField.cursorRectangle position

Evgeny Chesnokovrequested to merge
echesnokov/qqc2-desktop-style:menu_position into master

When opening a menu using a key combination, it must be opened next to the text field cursor, not the system one. This only affects opening the menu using the keyboard.

Windows Ubuntu KDE
photo_2024-09-12_12-28-53__2_ Screenshot_from_2024-09-12_12-01-31 Screenshot_20240912_123734
photo_2024-09-12_12-28-53 Screenshot_from_2024-09-12_12-00-43 Screenshot_20240912_124138
After changes
Screenshot_20240912_123913
Screenshot_20240912_124058

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