Colored trails

[gzotti]

Description

The planet trails are all shown in the same color. This PR re-uses the colors which are already used for the similarly-applied planet ephemeris curves from Astrocalc to draw the planet trails in distinct colors. (Colors for Uranus and Neptune have been added.)

In addition, duration for trails (years) can now be configured in the GUI.

In addition, the distinct curves limit has been raised from 5 to 9.

Fixes # (issue)

Screenshots (if appropriate):

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?

Test Configuration:

• Operating system: Windows 11
• Graphics Card: Geforce

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

[github-actions]

Great PR! Please pay attention to the following items before merging:

Files matching src/**/*.cpp:

• Are possibly unused includes removed?

Files matching guide/**:

• Did you remember to update screenshots to match new updates?
• Did you remember to grammar check in changed part of documentation?

This is an automatically generated QA checklist based on modified files.

[gzotti]

As usual, I have run RESET_UI_TO_QT5.sh. I have now compiled with Qt5.12, worked without a change. The CIs also work. What did you observe?

[alex-w]

As usual, I have run RESET_UI_TO_QT5.sh. I have now compiled with Qt5.12, worked without a change. The CIs also work. What did you observe?

Don’t worry, I said it before complete compiling the code. It’s a fail report