[Viewport] Modal operators prevent autosave

[regcs]

Describe the bug
A user on discord reported that Blender's autosave is not working when modal operators are running. The addon

To Reproduce
Steps to reproduce the behavior:

1. Install Alice/LG2.
2. Run Blender with the view frustum or live view activated
3. No autosave files are created

Expected behavior
Autosave should work as expected.

Platform & Versions (please complete the following information):

• OS: All platforms
• Blender Version: All versions
• Alice/LG Version All versions

Attach log files
This is a fundamental issue, since Blender does not allow autosave during modal operations:
https://developer.blender.org/T95171

[regcs]

The addon uses three modal operators for:

1. Drawing the view frustum (always on unless explicitly deactivated by the user)
2. Live view on the Looking Glass
3. Rendering of quilts and quilt animations

The modal operator (1) might be replaced with an alternative function. The modal operator (3) should not be an issue since during the rendering process no changes of the file should happen anyway. But modal operator (2) might be impossible to replace. At least for now I do not have an idea ...

[regcs]

Pre-release version of the autosave fix for frustum drawing is attached. Note: If the lightfield viewport is active, autosave is still blocked since this is a modal operator as well.

AliceLG.zip

[Draise14]

Testing

[Draise14]

Ok, tested. I have tested in latest 3.3 build of Blender, and all good. Thank you. Can work more comfortably.