#121 Assert failure: wxEXPAND flag will be overridden by alignment flags

[Amiga Lemming]

I have a non-trivial GUI application that recently shows a failure dialog on startup:

ASSERT INFO:
./src/common/sizer.cpp(1624): assert "CheckSizerFlags ( !(flags & (wxALIGN_BOTTOM | wxALIGN_CENTRE_VERTICAL)) || !(flags & (wxALIGN_RIGHT | wxALIGN_CENTRE_HORIZONTAL)) )" failed in DoInsert(): wxEXPAND flag will be overridden by alignment flags

DO NOT PANIC !!

If you're an end user running a program not developed by you, please ignore this message, it is harmless, and please try reporting the problem to the program developers.

You may also set WXSUPPRESS_SIZER_FLAGS_CHECK environment variable to suppress all such checks when running this program.

If you're the developer, simply remove either wxEXPAND or the alignment in at least one direction from your code to avoid getting this message. You can also call wxSizerFlags::DisableConsistencyChecks() to globally disable all such checks, but this is strongly not recommended.

BACKTRACE:
[1] wxGridSizer::DoInsert(unsigned long, wxSizerItem*)
[2] cdcXS_info ghc_116.c

However, I have not used wxEXPAND in my code. I guess it is implicitly used in wxhaskell code. I'm still investigating what widget actually causes this failure. What can I do to pinpoint the cause?

I am using wx-0.93.0.0 and libwxgtk3.0-gtk3-dev:amd64 3.0.5.1+dfsg-2.

[Amiga Lemming]

No, I think it is wxwidgets-3.2.4. I have used the Nix scripts and these provide wxwidgets-3.2.4, but the underlying Debian has wxgtk3.0.

[Amiga Lemming]

I have tracked down the issue. WxWidgets had a problem with an empty WX.row. In former wxwidgets versions this did not cause a warning.