[Octave-bug-tracker] [bug #50317] warning 'invalid operation' when using zoom on Qt figure

[Pantxo Diribarne]

Follow-up Comment #7, bug #50317 (project octave):

The cset from comment #5 fixes at least three opengl errors:
* We were using glPushMatrix without selecting a matrix mode, which at some
point lead to a "stack overflow" on the "present" matrix (MODELVIEW I guess)
* We were always using glPopMatrix on the PROJECTION matrix which lead to a
"stack underflow" on this one
* We were calling glLineWidth inside a glBegin/End block, which is not
allowed, and lead to an "invalid operation" error.

I think it is safe, and I would advise, to push it to stable. Can I do so? 

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