Too easy to delete labels with mouse mode; also no undo

[Tristan Croll]

The following bug report has been submitted:
Platform:        Windows-10-10.0.22631
ChimeraX Version: 1.8rc202405282004 (2024-05-28 20:04:22 UTC)
Description
Accidentally discovered after manually applying half a dozen custom-text labels to different residues: right-clicking in empty space with the "Label" right mouse mode (I actually *meant* to select the "Move label" mode) deletes *all* existing labels on residues, with no undo. This seems like undesirable behaviour to me.

Log:
> isolde shorthand
    
    
    Initialising ISOLDE-specific command aliases:
    Alias	Equivalent full command
    -------------------------------------------------
    st	isolde step {arguments}
    aw	isolde add water {arguments}
    awsf	isolde add water {arguments} sim false
    al	isolde add ligand {arguments}
    aa	isolde add aa $1 sel {arguments}
    ht	isolde mod his sel {arguments}
    so	setattr sel atoms occupancy {arguments}
    ab	isolde adjust bfactors {arguments}
    ss	isolde sim start sel
    rt	isolde release torsions sel {arguments}
    rd	isolde release distances sel {arguments}
    ra	rd; rt
    pf	isolde pepflip sel
    cf	isolde cisflip sel
    cbb	color bfactor {arguments}
    cbo	color byattr occupancy {arguments}
    cbc	color {arguments} bychain; color {arguments} byhet
    cs	clipper set contourSensitivity {arguments}
    

  
UCSF ChimeraX version: 1.8rc202405282004 (2024-05-28)  
© 2016-2024 Regents of the University of California. All rights reserved.  
How to cite UCSF ChimeraX  

> open 7atn format mmcif fromDatabase pdb

7atn title:  
Cytochrome c oxidase structure in R-state [more info...]  
  
Chain information for 7atn #1  
---  
Chain | Description | UniProt  
A | Cytochrome c oxidase subunit 1-beta | COX1B_PARDE 1-558  
B | Cytochrome c oxidase subunit 2 | COX2_PARDE -28-269  
C | Cytochrome c oxidase subunit 3 | COX3_PARDE 0-273  
D | Cytochrome c oxidase subunit 4 | COX4_PARDE 0-49  
  
Non-standard residues in 7atn #1  
---  
CA — calcium ion  
CU — copper (II) ion  
CUA — dinuclear copper ion  
HEA — heme-A  
MN — manganese (II) ion  
PC1 — 1,2-diacyl-Sn-glycero-3-phosphocholine (3-Sn-phosphatidylcholine)  
  

> label /B:88

> show /B:88

> ui mousemode right label

> label delete residues

> undo




OpenGL version: 3.3.0 NVIDIA 555.85
OpenGL renderer: NVIDIA GeForce RTX 3070 Laptop GPU/PCIe/SSE2
OpenGL vendor: NVIDIA Corporation

Python: 3.11.4
Locale: en_GB.cp1252
Qt version: PyQt6 6.6.1, Qt 6.6.1
Qt runtime version: 6.6.3
Qt platform: windows

Manufacturer: HP
Model: HP ZBook Studio 15.6 inch G8 Mobile Workstation PC
OS: Microsoft Windows 11 Pro (Build 22631)
Memory: 34,007,068,672
MaxProcessMemory: 137,438,953,344
CPU: 16 11th Gen Intel(R) Core(TM) i7-11800H @ 2.30GHz
OSLanguage: en-GB

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[Tom Goddard]

The purpose of that mouse mode is to create temporary labels, and so being able to delete them all easily is an intentional feature of the mode. Possibly it could remember all the labels it created and delete only those. That complicates code for an very rare circumstance. Unfortunately undo does not recreate deleted objects like labels -- that is also a design limitation.