Startup command line file arg hangs on Mac

[pett]

Starting ChimeraX like so on a Mac hangs:

/Applications/ChimeraX_Daily.app/Contents/MacOS/ChimeraX 1yew

because this code in chimerax.ui.gui.rapid_access_shown() (added by T.G.) to handle drag-and-drop startups somehow magically opens the 1yew command-line argument (instead of the code for that in ChimeraX_main.init()) and things go south from there:

ses.update_loop.block_redraw()
ses.ui.processEvents(QEventLoop.ExcludeUserInputEvents)
ses.update_loop.unblock_redraw()

[Tom Goddard]

That event processing code has not changed in 4 years and opening 1yew on the startup command-line works in ChimeraX 1.1 so it seems some other change is the immediate cause of the problem.

[Tom Goddard]

Fixed.

It is scary to see event processing outside the normal event loop -- leads to all kinds of bad behavior. The git commit says it was added to make drag and drop onto the application or dock icon work. I took that event processing out and those still work. So it seems no longer to be needed. I've removed it.