Session restore is unaware of BlastProteinResults

[Elaine Meng]

The following bug report has been submitted:
Platform:        macOS-10.15.7-x86_64-i386-64bit
ChimeraX Version: 1.3.dev202109120257 (2021-09-12 02:57:08 UTC)
Description
tried to save session with Blast Protein results

Log:
> open /Users/meng/Desktop/startup.cxc

> alias reset view orient; view initial

> alias start tool show $1

> alias whereprefs info path user unversioned config

> alias captut open help:user/tutorials/binding-sites.html#cap-example

> alias previewts toolshed url https://cxtoolshed-
> preview.rbvi.ucsf.edu;toolshed reload available

> alias normalts toolshed url https://cxtoolshed.rbvi.ucsf.edu;toolshed reload
> available

> alias btut open
> https://www.cgl.ucsf.edu/home/meng/chimerax/vdocs/user/tutorials/binding-
> sites.html

> alias stut open https://www.rbvi.ucsf.edu/chimerax/data/conservation-
> coloring/conservation-coloring.html

executed startup.cxc  
UCSF ChimeraX version: 1.3.dev202109120257 (2021-09-12)  
© 2016-2021 Regents of the University of California. All rights reserved.  
How to cite UCSF ChimeraX  

> open 7n98 format mmcif fromDatabase pdb

7n98 title:  
Cryo-EM structure of MFSD2A [more info...]  
  
Chain information for 7n98 #1  
---  
Chain | Description | UniProt  
A | Sodium-dependent lysophosphatidylcholine symporter 1 | NLS1_MOUSE  
  

> blastprotein #1/A database pdb cutoff 1e-3 matrix BLOSUM45 maxSeqs 100 name
> bp1

ChimeraX REST job id: job_454pu0mr  
BlastProtein finished.  
Parsing BLAST results.  

> open pdb:7MJS

7mjs title:  
Single-Particle Cryo-EM Structure of Major Facilitator Superfamily Domain
containing 2A in complex with LPC-18:3 [more info...]  
  
Chain information for 7mjs #2  
---  
Chain | Description | UniProt  
H | 2AG3 Fab heavy chain |  
L | 2AG3 Fab light chain |  
X | Major Facilitator Superfamily Domain containing 2A | F1NCD6_CHICK  
  
Non-standard residues in 7mjs #2  
---  
NAG — 2-acetamido-2-deoxy-beta-D-glucopyranose (N-acetyl-beta-D-glucosamine;
2-acetamido-2-deoxy-beta-D-glucose; 2-acetamido-2-deoxy-D-glucose;
2-acetamido-2-deoxy-glucose; N-ACETYL-D-GLUCOSAMINE)  
ZGS —
[(2~{R})-2-oxidanyl-3-[oxidanyl-[2-(trimethyl-$l^{4}-azanyl)ethoxy]phosphoryl]oxy-
propyl] (9~{Z},12~{Z},15~{Z})-octadeca-9,12,15-trienoate
(LysoPC(18:3(9Z,12Z,15Z)))  
  

> matchmaker #2/X to #1/A

Parameters  
---  
Chain pairing | bb  
Alignment algorithm | Needleman-Wunsch  
Similarity matrix | BLOSUM-62  
SS fraction | 0.3  
Gap open (HH/SS/other) | 18/18/6  
Gap extend | 1  
SS matrix |  |  | H | S | O  
---|---|---|---  
H | 6 | -9 | -6  
S |  | 6 | -6  
O |  |  | 4  
Iteration cutoff | 2  
  
Matchmaker 7n98, chain A (#1) with 7mjs, chain X (#2), sequence alignment
score = 1890.8  
RMSD between 192 pruned atom pairs is 1.098 angstroms; (across all 452 pairs:
7.394)  
  

> open pdb:7N98

7n98 title:  
Cryo-EM structure of MFSD2A [more info...]  
  
Chain information for 7n98 #3  
---  
Chain | Description | UniProt  
A | Sodium-dependent lysophosphatidylcholine symporter 1 | NLS1_MOUSE  
  

> matchmaker #3/A to #1/A

Parameters  
---  
Chain pairing | bb  
Alignment algorithm | Needleman-Wunsch  
Similarity matrix | BLOSUM-62  
SS fraction | 0.3  
Gap open (HH/SS/other) | 18/18/6  
Gap extend | 1  
SS matrix |  |  | H | S | O  
---|---|---|---  
H | 6 | -9 | -6  
S |  | 6 | -6  
O |  |  | 4  
Iteration cutoff | 2  
  
Matchmaker 7n98, chain A (#1) with 7n98, chain A (#3), sequence alignment
score = 2673.3  
RMSD between 473 pruned atom pairs is 0.000 angstroms; (across all 473 pairs:
0.000)  
  

> close #4

> close #3

> ui tool show "Blast Protein"

> ui tool show Clashes

> ui tool show "Crystal Contacts"

> ui tool show "Modeller Comparative"

Cannot run BLAST without a chain.  

> blastprotein #1/A database alphafold cutoff 1e-3 matrix BLOSUM45 maxSeqs 100
> name bp1

ChimeraX REST job id: job_6vnst5qz  
BlastProtein finished.  
Parsing BLAST results.  
Alignment identifier is bp1 [1]  
Associated 7n98 chain A to #1/A with 0 mismatches  
Showing conservation header ("seq_conservation" residue attribute) for
alignment bp1 [1]  

> save testblast.cxs

Traceback (most recent call last):  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/session.py", line 260, in discovery  
self.processed[key] = self.process(obj, parents)  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/session.py", line 293, in process  
return copy_state(data, convert=convert)  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/state.py", line 215, in copy_state  
return _copy(data)  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/state.py", line 200, in _copy  
items = [(_copy(k), _copy(v)) for k, v in data.items()]  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/state.py", line 200, in <listcomp>  
items = [(_copy(k), _copy(v)) for k, v in data.items()]  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/state.py", line 209, in _copy  
items = [_copy(o) for o in data]  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/state.py", line 209, in <listcomp>  
items = [_copy(o) for o in data]  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/state.py", line 213, in _copy  
return convert(data)  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/session.py", line 292, in convert  
return add_obj(obj, parents)  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/session.py", line 266, in _add_obj  
uid = _UniqueName.from_obj(self.session, obj)  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/session.py", line 143, in from_obj  
raise RuntimeError(  
RuntimeError: Unable to restore objects of BlastProteinResults class in
ChimeraX-BlastProtein bundle because the class name is not listed in the name
to class table for session restore  
  
During handling of the above exception, another exception occurred:  
  
Traceback (most recent call last):  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/session.py", line 882, in save  
session.save(output, version=version, include_maps=include_maps)  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/session.py", line 611, in save  
mgr.discovery(self._state_containers)  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/session.py", line 262, in discovery  
raise ValueError("error processing: %s: %s" % (_obj_stack(parents, obj), e))  
ValueError: error processing: 'tools' -> <chimerax.core.tools.Tools object at
0x7fc476a15f10>: Unable to restore objects of BlastProteinResults class in
ChimeraX-BlastProtein bundle because the class name is not listed in the name
to class table for session restore  
  
ValueError: error processing: 'tools' -> : Unable to restore objects of
BlastProteinResults class in ChimeraX-BlastProtein bundle because the class
name is not listed in the name to class table for session restore  
  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/session.py", line 262, in discovery  
raise ValueError("error processing: %s: %s" % (_obj_stack(parents, obj), e))  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/session.py", line 260, in discovery  
self.processed[key] = self.process(obj, parents)  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/session.py", line 293, in process  
return copy_state(data, convert=convert)  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/state.py", line 215, in copy_state  
return _copy(data)  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/state.py", line 200, in _copy  
items = [(_copy(k), _copy(v)) for k, v in data.items()]  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/state.py", line 200, in <listcomp>  
items = [(_copy(k), _copy(v)) for k, v in data.items()]  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/state.py", line 209, in _copy  
items = [_copy(o) for o in data]  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/state.py", line 209, in <listcomp>  
items = [_copy(o) for o in data]  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/state.py", line 213, in _copy  
return convert(data)  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/session.py", line 292, in convert  
return add_obj(obj, parents)  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/session.py", line 266, in _add_obj  
uid = _UniqueName.from_obj(self.session, obj)  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/session.py", line 143, in from_obj  
raise RuntimeError(  
RuntimeError: Unable to restore objects of BlastProteinResults class in
ChimeraX-BlastProtein bundle because the class name is not listed in the name
to class table for session restore  
  
During handling of the above exception, another exception occurred:  
  
Traceback (most recent call last):  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/cmd_line/tool.py", line 297, in execute  
cmd.run(cmd_text)  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/commands/cli.py", line 2856, in run  
result = ci.function(session, **kw_args)  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/save_command/cmd.py", line 75, in cmd_save  
Command(session, registry=registry).run(provider_cmd_text, log=log)  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/commands/cli.py", line 2856, in run  
result = ci.function(session, **kw_args)  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/save_command/cmd.py", line 89, in provider_save  
saver_info.save(session, path, **provider_kw)  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core_formats/__init__.py", line 84, in save  
return cxs_save(session, path, **kw)  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/session.py", line 882, in save  
session.save(output, version=version, include_maps=include_maps)  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/session.py", line 611, in save  
mgr.discovery(self._state_containers)  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/session.py", line 262, in discovery  
raise ValueError("error processing: %s: %s" % (_obj_stack(parents, obj), e))  
ValueError: error processing: 'tools' -> <chimerax.core.tools.Tools object at
0x7fc476a15f10>: Unable to restore objects of BlastProteinResults class in
ChimeraX-BlastProtein bundle because the class name is not listed in the name
to class table for session restore  
  
ValueError: error processing: 'tools' -> : Unable to restore objects of
BlastProteinResults class in ChimeraX-BlastProtein bundle because the class
name is not listed in the name to class table for session restore  
  
File
"/Users/meng/Desktop/ChimeraX_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-
packages/chimerax/core/session.py", line 262, in discovery  
raise ValueError("error processing: %s: %s" % (_obj_stack(parents, obj), e))  
  
See log for complete Python traceback.  
  




OpenGL version: 4.1 INTEL-14.7.18
OpenGL renderer: Intel Iris Pro OpenGL Engine
OpenGL vendor: Intel Inc.Hardware:

    Hardware Overview:

      Model Name: MacBook Pro
      Model Identifier: MacBookPro11,4
      Processor Name: Quad-Core Intel Core i7
      Processor Speed: 2.2 GHz
      Number of Processors: 1
      Total Number of Cores: 4
      L2 Cache (per Core): 256 KB
      L3 Cache: 6 MB
      Hyper-Threading Technology: Enabled
      Memory: 16 GB
      Boot ROM Version: 427.140.8.0.0
      SMC Version (system): 2.29f24

Software:

    System Software Overview:

      System Version: macOS 10.15.7 (19H1323)
      Kernel Version: Darwin 19.6.0
      Time since boot: 1:11

Graphics/Displays:

    Intel Iris Pro:

      Chipset Model: Intel Iris Pro
      Type: GPU
      Bus: Built-In
      VRAM (Dynamic, Max): 1536 MB
      Vendor: Intel
      Device ID: 0x0d26
      Revision ID: 0x0008
      Metal: Supported, feature set macOS GPUFamily1 v4
      Displays:
        Color LCD:
          Display Type: Built-In Retina LCD
          Resolution: 2880 x 1800 Retina
          Framebuffer Depth: 24-Bit Color (ARGB8888)
          Main Display: Yes
          Mirror: Off
          Online: Yes
          Automatically Adjust Brightness: No
          Connection Type: Internal

Locale: (None, 'UTF-8')
PyQt5 5.15.2, Qt 5.15.2
Installed Packages:
    alabaster: 0.7.12
    appdirs: 1.4.4
    appnope: 0.1.2
    Babel: 2.9.1
    backcall: 0.2.0
    blockdiag: 2.0.1
    certifi: 2021.5.30
    cftime: 1.5.0
    chardet: 4.0.0
    ChimeraX-AddCharge: 1.1.4
    ChimeraX-AddH: 2.1.10
    ChimeraX-AlignmentAlgorithms: 2.0
    ChimeraX-AlignmentHdrs: 3.2
    ChimeraX-AlignmentMatrices: 2.0
    ChimeraX-Alignments: 2.2.2
    ChimeraX-AlphaFold: 1.0
    ChimeraX-AltlocExplorer: 1.0.1
    ChimeraX-AmberInfo: 1.0
    ChimeraX-Arrays: 1.0
    ChimeraX-Atomic: 1.29.1
    ChimeraX-AtomicLibrary: 4.1.4
    ChimeraX-AtomSearch: 2.0
    ChimeraX-AtomSearchLibrary: 1.0
    ChimeraX-AxesPlanes: 2.0
    ChimeraX-BasicActions: 1.1
    ChimeraX-BILD: 1.0
    ChimeraX-BlastProtein: 2.0
    ChimeraX-BondRot: 2.0
    ChimeraX-BugReporter: 1.0
    ChimeraX-BuildStructure: 2.5.3
    ChimeraX-Bumps: 1.0
    ChimeraX-BundleBuilder: 1.1
    ChimeraX-ButtonPanel: 1.0
    ChimeraX-CageBuilder: 1.0
    ChimeraX-CellPack: 1.0
    ChimeraX-Centroids: 1.2
    ChimeraX-ChemGroup: 2.0
    ChimeraX-Clashes: 2.1
    ChimeraX-ColorActions: 1.0
    ChimeraX-ColorGlobe: 1.0
    ChimeraX-ColorKey: 1.4.1
    ChimeraX-CommandLine: 1.1.5
    ChimeraX-ConnectStructure: 2.0
    ChimeraX-Contacts: 1.0
    ChimeraX-Core: 1.3.dev202109120257
    ChimeraX-CoreFormats: 1.1
    ChimeraX-coulombic: 1.3.1
    ChimeraX-Crosslinks: 1.0
    ChimeraX-Crystal: 1.0
    ChimeraX-CrystalContacts: 1.0
    ChimeraX-DataFormats: 1.2.1
    ChimeraX-Dicom: 1.0
    ChimeraX-DistMonitor: 1.1.5
    ChimeraX-DistUI: 1.0
    ChimeraX-Dssp: 2.0
    ChimeraX-EMDB-SFF: 1.0
    ChimeraX-ExperimentalCommands: 1.0
    ChimeraX-FileHistory: 1.0
    ChimeraX-FunctionKey: 1.0
    ChimeraX-Geometry: 1.1
    ChimeraX-gltf: 1.0
    ChimeraX-Graphics: 1.1
    ChimeraX-Hbonds: 2.1.1
    ChimeraX-Help: 1.2
    ChimeraX-HKCage: 1.3
    ChimeraX-IHM: 1.1
    ChimeraX-ImageFormats: 1.2
    ChimeraX-IMOD: 1.0
    ChimeraX-IO: 1.0.1
    ChimeraX-ItemsInspection: 1.0
    ChimeraX-Label: 1.1
    ChimeraX-ListInfo: 1.1.1
    ChimeraX-Log: 1.1.4
    ChimeraX-LookingGlass: 1.1
    ChimeraX-Maestro: 1.8.1
    ChimeraX-Map: 1.1
    ChimeraX-MapData: 2.0
    ChimeraX-MapEraser: 1.0
    ChimeraX-MapFilter: 2.0
    ChimeraX-MapFit: 2.0
    ChimeraX-MapSeries: 2.1
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    ChimeraX-Mask: 1.0
    ChimeraX-MatchMaker: 2.0.1
    ChimeraX-MDcrds: 2.5
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    ChimeraX-Meeting: 1.0
    ChimeraX-MLP: 1.1
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    ChimeraX-ModelPanel: 1.1.1
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    ChimeraX-RotamerLibsDunbrack: 2.0
    ChimeraX-RotamerLibsDynameomics: 2.0
    ChimeraX-RotamerLibsRichardson: 2.0
    ChimeraX-SaveCommand: 1.5
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    ChimeraX-SDF: 2.0
    ChimeraX-Segger: 1.0
    ChimeraX-Segment: 1.0
    ChimeraX-SelInspector: 1.0
    ChimeraX-SeqView: 2.4.3
    ChimeraX-Shape: 1.0.1
    ChimeraX-Shell: 1.0
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    ChimeraX-Struts: 1.0
    ChimeraX-Surface: 1.0
    ChimeraX-SwapAA: 2.0
    ChimeraX-SwapRes: 2.1
    ChimeraX-TapeMeasure: 1.0
    ChimeraX-Test: 1.0
    ChimeraX-Toolbar: 1.1
    ChimeraX-ToolshedUtils: 1.2
    ChimeraX-Tug: 1.0
    ChimeraX-UI: 1.12
    ChimeraX-uniprot: 2.2
    ChimeraX-UnitCell: 1.0
    ChimeraX-ViewDockX: 1.0.1
    ChimeraX-VIPERdb: 1.0
    ChimeraX-Vive: 1.1
    ChimeraX-VolumeMenu: 1.0
    ChimeraX-VTK: 1.0
    ChimeraX-WavefrontOBJ: 1.0
    ChimeraX-WebCam: 1.0
    ChimeraX-WebServices: 1.0
    ChimeraX-Zone: 1.0
    colorama: 0.4.4
    cxservices: 1.1
    cycler: 0.10.0
    Cython: 0.29.23
    decorator: 5.1.0
    distlib: 0.3.1
    docutils: 0.17.1
    filelock: 3.0.12
    funcparserlib: 0.3.6
    grako: 3.16.5
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[Eric Pettersen]

Zach, the session-restore machinery needs to know how to get the BlastProteinResults class from your bundle. You meed to implement the 'get_class' method of your BundleAPI. See swap_res/init.py for an example.

[Zach Pearson]

Thanks, Eric! I also need to override take_snapshot and restore_snapshot of ToolInstance to restore the tool correctly, right?

[Zach Pearson]

Should be fixed by ​this commit.

[Elaine Meng]

I verified that the daily build saves/restores blast results, yay!  However, it does not remember which columns are shown or the sort order, so that stuff still needs to be fixed.
Elaine

[Eric Pettersen]

FYI Zach, you can get the table's state with its .session_info() method, and then use that state in its .launch() call with the 'session_info' keyword. The swap_res bundle does this, but does some additional work because the table may have had columns added by user request (so it needs to track that too).

[Zach Pearson]

​This commit should do it, but I'll hold off on closing this until you can verify it's working. Sorry for the premature close last time. :)

[Zach Pearson]

Fixed the Qt bug (#5238) that was holding up closure of this ticket.