Incr. size dummy QACanvas to 5x5 pixels, fix bad text size w/ Deb12

Redmine: Refs #3151

Avoid crazy values in automatic computation of Pad and text sizes under Debian12 (and maybe other OSes, but at least on this one it leads to an error message)

@f.uhlig not sure if it needs to be backported to the release as only the tracking QA is affected from what I could see in the CI

requested review from @se.gorbunov

assigned to @f.uhlig

Dear @se.gorbunov, @s.zharko,

you have been identified as code owner of at least one file which was changed with this merge request.

Please check the changes and approve them or request changes.

added CodeOwners label

approved this merge request

changed milestone to %OCT23

added BugFix QA labels

added 4 commits

• 62f8809d...d2c2e1fe - 3 commits from branch computing:master
• 589839a3 - Incr. size dummy QACanvas to 5x5 pixels, fix bad text size w/ Deb12, refs #3151

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enabled an automatic merge when the pipeline for 589839a3 succeeds

merged

added Ported label