Residue.ribbon_color[:3] -> error, slicing on tinyarray not supported

[goddard@…]

The following bug report has been submitted:
Platform:        macOS-13.4.1-x86_64-i386-64bit
ChimeraX Version: 1.7.dev202308222255 (2023-08-22 22:55:59 UTC)
Description
Residue.ribbon_color is a tinyarray and cannot be sliced.  Slicing is sometimes desired for instance color[:3] to strip off the alpha value.  Atom.color is a tuple.  It is strange that they are different.  Maybe both should be tuple.

from chimerax.atomic import selected_residues

r = selected_residues(session)[0]

c = r.ribbon_color

c[:3]
---------------------------------------------------------------------------
NotImplementedError                       Traceback (most recent call last)
Cell In[4], line 1
----> 1 c[:3]

NotImplementedError: Slices are not implemented.


Log:
Could not find tool "Tabbed Toolbar"  
UCSF ChimeraX version: 1.7.dev202308222255 (2023-08-22)  
© 2016-2023 Regents of the University of California. All rights reserved.  
How to cite UCSF ChimeraX  

> ui tool show Shell

0.00s - Debugger warning: It seems that frozen modules are being used, which
may  
0.00s - make the debugger miss breakpoints. Please pass -Xfrozen_modules=off  
0.00s - to python to disable frozen modules.  
0.00s - Note: Debugging will proceed. Set PYDEVD_DISABLE_FILE_VALIDATION=1 to
disable this validation.  

> open 1gcn format mmcif fromDatabase pdb

1gcn title:  
X-ray analysis of glucagon and its relationship to receptor binding [more
info...]  
  
Chain information for 1gcn #1  
---  
Chain | Description | UniProt  
A | GLUCAGON | GLUC_PIG 1-29  
  

> select /A:6

11 atoms, 11 bonds, 1 residue, 1 model selected  




OpenGL version: 4.1 ATI-4.12.7
OpenGL renderer: AMD Radeon Pro 580 OpenGL Engine
OpenGL vendor: ATI Technologies Inc.

Python: 3.11.2
Locale: UTF-8
Qt version: PyQt6 6.3.1, Qt 6.3.1
Qt runtime version: 6.3.2
Qt platform: cocoa
Hardware:

    Hardware Overview:

      Model Name: iMac
      Model Identifier: iMac18,3
      Processor Name: Quad-Core Intel Core i7
      Processor Speed: 4.2 GHz
      Number of Processors: 1
      Total Number of Cores: 4
      L2 Cache (per Core): 256 KB
      L3 Cache: 8 MB
      Hyper-Threading Technology: Enabled
      Memory: 32 GB
      System Firmware Version: 512.0.0.0.0
      OS Loader Version: 577~170
      SMC Version (system): 2.41f2

Software:

    System Software Overview:

      System Version: macOS 13.4.1 (22F82)
      Kernel Version: Darwin 22.5.0
      Time since boot: 71 days, 14 hours, 58 minutes

Graphics/Displays:

    Radeon Pro 580:

      Chipset Model: Radeon Pro 580
      Type: GPU
      Bus: PCIe
      PCIe Lane Width: x16
      VRAM (Total): 8 GB
      Vendor: AMD (0x1002)
      Device ID: 0x67df
      Revision ID: 0x00c0
      ROM Revision: 113-D000AA-931
      VBIOS Version: 113-D0001A1X-025
      EFI Driver Version: 01.00.931
      Metal Support: Metal 2
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        iMac:
          Display Type: Built-In Retina LCD
          Resolution: Retina 5K (5120 x 2880)
          Framebuffer Depth: 30-Bit Color (ARGB2101010)
          Main Display: Yes
          Mirror: Off
          Online: Yes
          Automatically Adjust Brightness: Yes
          Connection Type: Internal


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[Tom Goddard]

Fixed.

I changed Residue ribbon_color and ring_color to return tuples instead of tinyarray so slicing works. This makes Residue colors return the same type (tuple) as Atom.color.