Fix heatmap gaps and ticket alignment

[dschweinbenz]

New Pull Request

Added x-axis check to include gaps into a heatmap. To be honest my code is more a "dirty fix" as i used some of the globals variables without knowing if that is the correct way to handle it. So please review the code carefully and if you know a better solution improve it.

Test:

Fixes #4809

Type of change

Please delete options that are not relevant.

• 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 not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• 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
• My branch is up to date with any changes from the main branch