Has libreoffice-fresh been fixed? I am referring to this:
Various issues when using LibreOffice 6.2.0 on KDE Plasma 5 (can’t copy+paste, can’t use backspace in Calc, etc.)
Unfortunately, it seems that the new upstream VCL plugin for integration in KDE5 Plasma (see this notice from LibreOffice ) isn’t perfectly functional yet. Upstream is aware of the situation and fixes will come in future versions of LibreOffice.
Examples of related bug reports from the Document Foundation
Workaround for LibreOffice 6.2.0: you may force Libre Office to use a different VCL by editing /etc/profile.d/libreoffice-fresh.sh, uncommenting the VCL you want to use, and rebooting.
More info about VCL: https://wiki.archlinux.org/index.php/LibreOffice#Theme
You may also consider to switch from LibreOffice Fresh to LibreOffice Still, the latter being at version 6.1.5.