[Octave-bug-tracker] [bug #49083] demo camlight fails using qt graphics_toolkit

[Markus Mützel]

Follow-up Comment #2, bug #49083 (project octave):

I can see the same error for the 4.2.0-rc1 on Windows. This error was probably
introduced with changeset 2aac9ec7df29 from bug #48669 (and patch #8943) which
moved the fist call of "get_maxlight" until after the window was created to
resolve issues with fltk.

It looks like qt tries to add the light before the window was opened which
results in the behavior you describe.

When you get lights to work once (e.g. by calling "demo light 1"). It will
work correctly until the end of the session.

I am not familiar enough with fltk to judge how this "dilemma" can be
resolved. CC'ing Dan Sebald who I believe a much better expert.

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