Qt: MessageDlg() have wrong results with recent changes

Original Reporter info from Mantis: zeljko@holobit.net @zeljan1

• Reporter name: Zeljan Rikalo

Description:

EscapeButton is wrongly mapped, so it doesn't work correct.
Eg. dialog with mbOk and mbYes cannot be closed with Escape or [x]
dialog without mbCancel results with button (if added) mbNo, mbClose.

Mantis conversion info:

• Mantis ID: 21885
• Version: 1.1 (SVN)
• Fixed in revision: 37075 (#e7681a36)
• Target version: 1.0