Surrounding white frame in fullscreen

[Pavel Sanda]

On Sat, Nov 21, 2020 at 05:24:34PM +0100, Stephan Witt wrote:
> >>> until (at least) Qt 5.7.1 fullscreen was over the whole screen, in newer Qt
> >>> (tested 5.11.3) there is now two bright pixel frame around (well visible and
> >>> annoying if you use dark color schemes).  This is because the former workaround
> >>> trick with setContentsMargins(-2, -2, -2, -2); in fullscreen handler (or
> >>> ui-toggle frame lfun) does not work anymore and negative values are not
> >>> accepted now.
> >>> 
> >>> The margin might be coming from some child widget of QMainWindow, I just dont
> >>> know which one. Anyone has idea how to fix that?
> >> 
> >> The following patch fixes the problem. 
> >> Stephan/Yu can you test whether I did not break fullscreen border on mac/windows?
> > 
> > It's in now, still waiting for Stephen/Yu feedback.
> > Pavel
> 
> IMO you didn???t break fullscreen border. Here on Mac it looks normal.

Good, thanks. 

Riki, this should go to branch, up to you whether 2.3.6 or 2.3.7.

Pavel