fix unexpected close when launch external app

[Alaskra]

fix #2562

[Alaskra]

I don't understand the meaning of comment, but the code have effect to linux and cause the problem of launchapp. So I add the MACOS macro.

[Alaskra]

flameshot gui won't exit if click copy or pin button after capture because there is no window close to trigger qt's quitOnLastWindowClose(the caputrewidget set attribute Qt::WA_QuitOnClose to false for some reason I don't know, so close it don't trigger quit). So I create and close the window just to trigger quit.

[ramseyrashid]

Any way we can get this one prioritized? Thanks!

[borgmanJeremy]

@ramseyrashid I am still thinking this over. I'm not pleased with this hack but don;t have an alternative solution yet.

[mohad12211]

is there some other alternative to this hacky solution?
opening and closing a window on a tiling window manger like dwm in my case, will mess with the size of the other windows for a moment because it tries to tile the window, it's annoying with a lot of apps, example:

Peek.2022-06-16.02-14.mp4

[borgmanJeremy]

I was worried something strange would happen☹️

I did not think of an alternative but am open to suggestions

[Alaskra]

@mohad12211 @borgmanJeremy I remove the hack in #2675. Is this ok?

[mohad12211]

Yes, #2675 introduces no issues with the window manager, and the "launch external app" works with no problems.