[Libreoffice-bugs] [Bug 122161] New: UI: Bright screen flashing when starting Impress presentation

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=122161

            Bug ID: 122161
           Summary: UI: Bright screen flashing when starting Impress
                    presentation
           Product: LibreOffice
           Version: 6.1.3.2 release
          Hardware: All
                OS: Linux (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Impress
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: gtxe at gmx.net

Description:
When starting prestentation, the Presentation display flashes with a bright
color  (it is the window background color defined in the gtk theme).
Using a dark gtk theme, it flashes with a dark color.
The duration is longer, if the first slide is more complex (big picture for
example).
It looks little nonprofessional.
Tested with Manjaro (Xfce), openSUSE Leap (KDE), Fedora (Gnome): always the
same.

I've made a workaround for this. It works good with disabled Presenter Console
(there is another Bug). May be there are side effects for other gtk
applications.

create a new file: ~/.config/gtk-3.0/gtk.css

/* avoid bright flickering when starting presentation with LibreOffice Impress
*/
window.background.fullscreen {
        background-color: #000000;
}


Steps to Reproduce:
1. Use bright desktop theme (specialy for gtk)
2. Create new Impress presentation with a big picture on the first slide (>4MP)
3. start presentation (F5)

Actual Results:
Screen flashes white, then black and then it shows the slide.

Expected Results:
Screen shows the slide (without flickering / flashing) when start presentation.
Custom color (Options -> Application Colors) would be great.


Reproducible: Always


User Profile Reset: No


OpenGL enabled: Yes

Additional Info:
Version: 6.1.3.2
Build ID: 6.1.3-2
CPU threads: 4; OS: Linux 4.19; UI render: default; VCL: gtk3; 
Locale: de-DE (de_DE.utf8); Calc: group threaded

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