It is impossible to delete something with the backspace key when you work with Calc.
Steps to Reproduce:
2.Enter something in a cell
3.Use the backspace key
It should delete the character on the left.
User Profile Reset: Yes
It seems to be related to KDE. The backspace key is functional with another computer that works with the same Mageia 6.1 but with LXDE instead of Plasma.
Build ID: 98c6a8a1c6c7b144ce3cc729e34964b47ce25d62
Threads CPU : 4; OS : Linux 4.14; UI Render : par défaut; VCL: kde5;
Locale : fr-FR (fr_FR.UTF-8); Langue IHM : fr-FR
Thanks for reporting this issue.
This is a duplicate of bug 122238 and it will be fixed in LibreOffice 220.127.116.11, which is released in 2 weeks from now
*** This bug has been marked as a duplicate of bug 122238 ***