Merge branch 'feature/shut-up-compiler-warnings' into 'master'

Markus Blattrequested to merge
cherry-pick-8b107865 into releases/2.8

get rid of unused/shadowed variable compiler warnings.

See merge request !981 (merged)

(cherry picked from commit 8b107865)

0d862660 get rid of unused/shadowed variable compiler warnings.

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