[Interest] Support for NSDragOperationDelete in Qt Cocoa

[Иван Комиссаров]

As i looked into qt code (both qt4 and qt5), it is not possible to enable this flag for a drag and drop.

This flag is needed to allow dropping to a mac trash. Is there some reasons why it's not included into Qt::ActionMask and/or MoveAction enums (what i mean - are there some bugs/ limitations in current code, or this can be done easily?).

What i suggest - keep current Qt enum, but implicitly convert Qt::MoveAction into flag NSDragOperationMove | NSDragOperationDelete instead of NSDragOperationMove.

Иван Комиссаров
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