changed File-Extension Check to be Qt::CaseInsensitive

ar.graf requested to merge 317-case-sensitivity-on-file-endings into master

Changed Fileextension Checks to be Qt::CaseInsensitive. Closes #317 (closed)

Reviewer Checklist

Formatting

  • the pre-build checks succeed

General code quality

  • naming conventions are met (see .clang-tidy for detailed information)
  • no static analyzer warnings in new code parts (e.g., use clang-tidy for checking)

General usability

  • old versions of pet-files are still loadable

Only if changes in UI

  • new elements are also saved and loaded from pet-file
  • check if tab order is still correct
  • all new SpinBoxes are promoted
  • new keybindings added to Petrack::keyBindings()
Edited by Schrödter, Tobias

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