On 12.08.19 05:18, Scott Talbert wrote: > On Sun, 11 Aug 2019, Olly Betts wrote: > >>> If a draw context is used and wxWidgets 3.0 (3.1 isn't affected, but >>> isn't packaged with debian as it is the development version) uses GTK3 >>> the background is likely not to be cleared before a redraw as >>> wxDC::Clear() doesn't work under these circumstances. >> >> I tried to reproduce your bug by patching the drawing sample in the wx >> source code using the attached patch, but it seems to work fine for me. >> >> If you cd to the drawing subdirectory and run: >> >> make -f makefile.unx WX_PORT=gtk3 >> >> Then double-check that it's linked to the GTK3 version: >> >> ldd drawing|grep libwx_gtk >> >> And then run it: >> >> ./drawing >> >> This prints "Clear()" to the console (so we are running the patched >> code) but the window doesn't have a hatching on the background. If >> you remove the dc.Clear() just after where I've patched and rerun >> the make command above then the window has hatching over it. So >> clearly wxDC::Clear() is working in this case. >> >> So I'm afraid I don't seem to be able to reproduce your problem. >> >> Please can you come up with a small reproducer (upstream like a patch >> against one of their samples) and file a bug upstream? > > Gunter did file a bug upstream: > https://trac.wxwidgets.org/ticket/18463 > > However, Olly's request about making a reproducer still stands. > > Gunter - also - what desktop environment are you using (e.g., Gnome, > KDE, XFCE, etc.). And are you running on X11 or Wayland? > Gnome on Wayland; For wxMaxima (the package I maintain myself) after receiving the first screen shots with a background that clearly showed that Clear() is't worked (none of the affected users complained about this problem, as its symptoms aren't too bad for this specific program) I have introduced a workaround: I paint a solid rectangle in the background on gtk3 instead of calling Clear() => If this bug is closed as "can't reproduce" I won't be angry.
Kind regards, Gunter.
