qt: Fix Window -> Minimize menu item #18549

1. 
   hebasto commented at 9:47 pm on April 6, 2020: member

   Now Window -> Minimize menu item is broken on Linux.

   Steps to reproduce:

   1. start bitcoin-qt
   2. activate Window -> Minimize menu item with a keyboard (not by a shortcut) or a mouse

   Expected behavior

   The main window gets minimized.

   Actual behavior

   The main window still unchanged. Even worse: the menu widget becomes a separate window:

   

   This PR does not touch the macOS specific code as qApp->focusWindow() seems work on macOS flawlessly.

2. qt: Fix Window -> Minimize menu item 56fe839e4e
3. 
   hebasto commented at 9:47 pm on April 6, 2020: member

   cc: @promag
4. fanquake added the label GUI on Apr 6, 2020
5. 
   MarcoFalke commented at 11:29 pm on April 6, 2020: member

   Has this ever worked? When did it break?
6. 
   promag commented at 11:30 pm on April 6, 2020: member

   Tested ACK 56fe839e4e6d837b95b920a524570d11f7c3c5ce on bionic with qt 5.9.5.
7. MarcoFalke added this to the milestone 0.20.0 on Apr 6, 2020
8. 
   promag commented at 0:03 am on April 7, 2020: member

   @MarcoFalke I don’t know, it was added in #14573, maybe it never worked right on linux.
9. 
   promag commented at 8:43 am on April 7, 2020: member

   @MarcoFalke I confirm that the problem always existed since it was introduced in 95a5a9fccb8b4296d2db1270a9798c359c9c1cf6.
10. MarcoFalke merged this on Apr 7, 2020
11. MarcoFalke closed this on Apr 7, 2020

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12. hebasto deleted the branch on Apr 7, 2020
13. MarkLTZ referenced this in commit 3ec6a5c547 on Apr 9, 2020
14. jasonbcox referenced this in commit 0e60c8d5b7 on Oct 13, 2020
15. ftrader referenced this in commit e282d7c8b0 on Apr 14, 2021
16. PastaPastaPasta referenced this in commit b05763a21f on Sep 17, 2021
17. PastaPastaPasta referenced this in commit 05c94c713d on Sep 17, 2021
18. PastaPastaPasta referenced this in commit 590ea9a24a on Sep 18, 2021
19. thelazier referenced this in commit 56b70d4d6f on Sep 25, 2021
20. DrahtBot locked this on Feb 15, 2022

Contributors
hebasto MarcoFalke promag

Labels
GUI

Milestone
0.20.0