SCM Plugin: bug fixes

[xLPMG]

While using the plugin, I have noticed a few small things that did not seem to work as intended. Instead of creating separate issues for each bug, I decided to fix them in one batch. Specifically:

• Fix: Drawn constellations are not reset after "Export and Exit"
• Fix: Stop drawing line key (Double Right Click) only works when Star/DSO is selected
• Fix: Not all SC description input fields that are marked required are actually checked
• Fix: No formal checks for 'Constellations' input field in SC description

For reasons of transparency, I have also updated the changelog. I suppose version 1.0.1 of the plugin will contain all changes up to the 25.4 release.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• This change requires a documentation update
• Housekeeping

How Has This Been Tested?

Manual tests.

Test Configuration:

• Operating system: MacOS 26.0.1
• Graphics Card: Apple M3 Pro

Checklist:

• My code follows the code style of this project.
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (header file)
• I have updated the respective chapter in the Stellarium User Guide
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[alex-w]

Thanks!

[github-actions]

Hello @xLPMG!

Please check the fresh version (development snapshot) of Stellarium:
https://github.com/Stellarium/stellarium-data/releases/tag/weekly-snapshot

[github-actions]

Hello @xLPMG!

Please check the latest stable version of Stellarium:
https://github.com/Stellarium/stellarium/releases/latest