added checkbox to disable example loader directly in dialog

[JonasKlamroth]

Intended Change

Added a checkbox to the example loader dialog that allows to hide it on subsequent startups. I consider this a reasonable change as this functionality is already supported by KeY but hidden in the preferences which most user might never open. Additionally i think this is standard behavior for similar IDEs or programs. No default behavior is changed.

Type of pull request

• Bug fix (non-breaking change which fixes an issue)
• Refactoring (behaviour should not change or only minimally change)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• There are changes to the (Java) code
• There are changes to the taclet rule base
• There are changes to the deployment/CI infrastructure (gradle, github, ...)
• Other:

Ensuring quality

• I made sure that introduced/changed code is well documented (javadoc and inline comments).
• I made sure that new/changed end-user features are well documented (https://github.com/KeYProject/key-docs).
• I added new test case(s) for new functionality.
• I have tested the feature as follows: Multiple startups with all possible configurations.
• I have checked that runtime performance has not deteriorated.

Additional information and contact(s)

The contributions within this pull request are licensed under GPLv2 (only) for inclusion in KeY.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 37.91%. Comparing base (1fb0c10) to head (b4cb677).
Report is 18 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #3424      +/-   ##
============================================
+ Coverage     37.77%   37.91%   +0.14%     
- Complexity    17031    17070      +39     
============================================
  Files          2076     2076              
  Lines        126950   127019      +69     
  Branches      21381    21388       +7     
============================================
+ Hits          47952    48164     +212     
+ Misses        73092    72949     -143     
  Partials       5906     5906              

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[FliegendeWurst]

GUI change looks good. Code is reasonable.

[wadoon]

force pushed for reformat.

[WolframPfeifer]

Thanks! That is a nice usability feature!