regression in daily build - can't open molecule in nogui mode

[Greg Couch]

UCSF ChimeraX version: 0.8 (2018-08-25)
cmd> open 1gcn
Executing: open 1gcn
Opening mmCIF 1gcn
_1gcn_ title:  
 **X-ray analysis of glucagon and its relationship to receptor binding**
[[more&nbspinfo...;]](cxcmd:log metadata #1)  
  

Chain information for 1gcn #1  
---  
Chain | Description  
[A](cxcmd:sequence chain #1/A "Show sequence") | glucagon  
  


Unexpected exception, save your work and exit:

Traceback (most recent call last):
  File "/home/chimera/chimerax_daily/lib/python3.6/site-packages/chimerax/core/nogui.py", line 211, in execute
    self._cmd.run(text)
  File "/home/chimera/chimerax_daily/lib/python3.6/site-packages/chimerax/core/commands/cli.py", line 2561, in run
    result = ci.function(session, **kw_args)
  File "/home/chimera/chimerax_daily/lib/python3.6/site-packages/chimerax/core/commands/open.py", line 41, in open
    from_database=from_database, ignore_cache=ignore_cache, **kw))
  File "/home/chimera/chimerax_daily/lib/python3.6/site-packages/chimerax/core/commands/open.py", line 85, in open
    session.models.add(models)
  File "/home/chimera/chimerax_daily/lib/python3.6/site-packages/chimerax/core/models.py", line 431, in add
    v.initial_camera_view()
  File "/home/chimera/chimerax_daily/lib/python3.6/site-packages/chimerax/core/graphics/view.py", line 549, in initial_camera_view
    b = self.drawing_bounds()
  File "/home/chimera/chimerax_daily/lib/python3.6/site-packages/chimerax/core/graphics/view.py", line 518, in drawing_bounds
    self.check_for_drawing_change()
  File "/home/chimera/chimerax_daily/lib/python3.6/site-packages/chimerax/core/graphics/view.py", line 226, in check_for_drawing_change
    if trig and self._use_opengl():
  File "/home/chimera/chimerax_daily/lib/python3.6/site-packages/chimerax/core/graphics/view.py", line 99, in _use_opengl
    raise RuntimeError("running without graphics")
RuntimeError: running without graphics

[Tom Goddard]

Fixed.

I added code a few days ago to make the opengl context current during the "graphics update" trigger so 3d labels could delete their textures. Previously it was assumed opengl context was not current during this trigger. Trying to make it current broke in nogui mode causing this error. Seemed better to revert to previous behavior since no other code needed the context to be current.