Created attachment 135132 [details]
See the issue happenning

SUMMARY


STEPS TO REPRODUCE
1. Write into the password field box in the lock screen

OBSERVED RESULT
When empty, it has a default size, when editing, it resizes to a little bit higher and vertically aligns text to the top.
When erased and is empty once again, it resizes to its default size.
The resizes is hard to realize, but it happens.

EXPECTED RESULT
It should remain of the same size, and with the same alignment. Maybe previously calculating the size it will require from the font sizes selected by the user.

NOTE
If I were allowed to guess, I would say that this issue may be related with the global fonts size config, which I have tweaked to increase all font sizes by 1.

SOFTWARE/OS VERSIONS
Operating System: KDE neon 5.20
KDE Plasma Version: 5.20.5
KDE Frameworks Version: 5.78.0
Qt Version: 5.15.2
Kernel Version: 5.4.0-62-generic
OS Type: 64-bit

ADDITIONAL INFORMATION
Am also using Spanish (Es-es) as my default language and English as my fallback language. Format for numbers, dates, etc remains in English.