Description:
Using Write, I notice a bizarre behavior of the shift-F3 command (forcing uppercase-lowercase): I select a text (one or more words) then I press shift-F3 but the changes affect the entire period (I think between one point and another), instead of just the selected text.
This happens when some other words in the phrase, not selected, are uppercased. It is needed these words remain in the original condition (all uppercase, or only initial letter uppercase) and change only the selected character/words.


Steps to Reproduce:
1.Write a phrase with some words all uppercas and some lowercase
2.Select a part of text lowercase (normal)
3.press Shift-F3 several times, in order to change uppercase/lowercase/capital initial
4.observe the result in all phrase / paragraph (maybe between two fullstops.

Actual Results:
the changes affect the entire period, instead of just the selected text.

Expected Results:
the changes shall affect only the selected text.


Reproducible: Always


User Profile Reset: No

Additional Info:
Versione: 6.4.7.2
Build ID: 1:6.4.7-0ubuntu0.20.04.8
Thread CPU: 8; SO: Linux 5.15; Resa interfaccia: predefinito; VCL: gtk3; 
Versione locale: it-IT (it_IT.UTF-8); Lingua interfaccia: it-IT
Calc: threaded