Model panel, list index out of range, restoring session

[chimerax-bug-report@…]

The following bug report has been submitted:
Platform:        Darwin-18.7.0-x86_64-i386-64bit
ChimeraX Version: 0.91 (2019-11-26)
Description
(Describe the actions that caused this problem to occur here)

Log:
Startup Messages  
---  
warning | 'clip' is a prefix of an existing command 'clipper'  
  
UCSF ChimeraX version: 0.91 (2019-11-26)  
© 2016-2019 Regents of the University of California. All rights reserved.  
How to cite UCSF ChimeraX  

> open /Users/chunyan/2020/gp8-asym/gp8-asym-20200521-with-movie.cxs

opened ChimeraX session  
Traceback (most recent call last):  
File
"/private/var/folders/_7/78g_4hlj7_72zms4nq9fj3ph0000gn/T/AppTranslocation/E6FA7E92-F40A-4A4F-8663-A08F0A642710/d/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/core/triggerset.py", line 130, in invoke  
return self._func(self._name, data)  
File
"/private/var/folders/_7/78g_4hlj7_72zms4nq9fj3ph0000gn/T/AppTranslocation/E6FA7E92-F40A-4A4F-8663-A08F0A642710/d/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/model_panel/tool.py", line 158, in <lambda>  
lambda *args, ft=self._fill_tree: ft(always_rebuild=True))  
File
"/private/var/folders/_7/78g_4hlj7_72zms4nq9fj3ph0000gn/T/AppTranslocation/E6FA7E92-F40A-4A4F-8663-A08F0A642710/d/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/model_panel/tool.py", line 203, in _fill_tree  
parent = item_stack[0] if len(item_stack) == 1 else item_stack[len_id-1]  
IndexError: list index out of range  
  
Error processing trigger "new frame":  
IndexError: list index out of range  
  
File
"/private/var/folders/_7/78g_4hlj7_72zms4nq9fj3ph0000gn/T/AppTranslocation/E6FA7E92-F40A-4A4F-8663-A08F0A642710/d/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-
packages/chimerax/model_panel/tool.py", line 203, in _fill_tree  
parent = item_stack[0] if len(item_stack) == 1 else item_stack[len_id-1]  
  
See log for complete Python traceback.  
  




OpenGL version: 4.1 INTEL-12.10.12
OpenGL renderer: Intel(R) Iris(TM) Plus Graphics 655
OpenGL vendor: Intel Inc.

[Eric Pettersen]

Similar to #3279 -- same user, related session.