While apparently default button sets like ok/cancel pair or some other that has some additional over those have a default set automatically, so one can just press enter without mouse-clicking the button. But for more custom buttoms it seems that the default focus disappears, and hitting enter does nothing. At least depending on the entirety of the dialog, maybe it has some nonsensical focus on some other area where it doesn't really respond to "enter," like "--picture," maybe...

Have kdialog preceeded by (or succeeded after an "&" if the context allows it, and if it's preferable for some reason) a loop that has wmctrl "grepping"/activating" the unique name of the kdialog window, followed by xdotool resizing it, and breaking the loop.

...

I have come across several shell scripts that are very very interesting.

First off are the scripts that make using fzf really useful:
https://github.com/atweiden/fzf-extras
https://github.com/lincheney/fzf-tab-completion

Then the ones for when you are writing a shell script:
https://www.shellcheck.net/
https://github.com/anordal/shellharden

Ones that can help you from making a mistake using a terminal command:
https://github.com/kaplanelad/shellfirm...

I used to just have lots of "echos" around my scripts printing where it is on a loop or whatever, so I have a better idea of whats happening, often somewhat more clear than with "bash -x", even though that also may help, of course. But the odds are that I'd at some point just leave such debug echos there while the script runs on a daily basis on the background, just helping .xsession-errors to become enormous, for no good reason, since it's working and I'm not reading it. And...

Largely based on this answer on askubuntu. I hope nothing atrocious results from some situation where it ends up trying to mount something a given user should not, or something. May require tweaking either the script or one's sudo permissions for the commands doing the hard work, I don't know how "default" my settings are.

...