[Feature request] Option to customize set of semantic selection split characters

[Vladimir-csp]

Is your feature request related to a problem? Please describe.

It seems that the set in question is hardcoded to something like whitespaces and =<>[]{}()#, which makes doubleclick selections pretty greedy.

Describe the solution you'd like

An option in preferences to customize this set of characters.

Describe eventual alternatives you've considered

Context

[yan12125]

I wanted this feature since 2017 but I'm too lazy to finish the patch!
lxqt/qtermwidget@991a902
2f3035f

(edited to use commits are relevant branches are deleted)