Where does Okular store its config files?

Solution 1:

As you've found, neither ~/.config/okularpartrc nor ~/.config/okularrc store information relating to changes made to the main toolbar.

Here's an image of the toolbar I have before adding a couple of buttons:

I then used the GUI found in Settings > Configure Toolbars to add a couple of buttons (outlined in red) as seen below:

I found that these changes were recorded in ~/.local/share/kxmlgui5/okular/shell.rc, in Kubuntu 18.04.

On running diff on shell.rc before and after the changes I get:

$ diff 0shell.rc 1shell.rc
24a25
>   <Separator weakSeparator="1"/>
58a60,61
>   <Action name="help_contents"/>
>   <Action name="help_about_kde"/>
$ 

Of course, the line numbers maybe different on your system.

You've mentioned that copying the entire home folder doesn't help and I would assume that ~/.local/share/kxmlgui5/okular/shell.rc would be copied as well in which case you should have been able to carry over the changes. It's possible that something else is required but I don't know what that would be.

Edit: I just installed okular on Lubuntu 18.04. The same file, ~/.local/share/kxmlgui5/okular/shell.rc, exists there as well.

Solution 2:

By defining some marker pens and applying sudo find . -atime -1 -type f > ~/q and searching in the result file /q for all occurrences of "okular" I finally found this file for a snap-installed Okular Version 1.7.2 on Xubuntu 18.04, which had the proper atime-stamp:

~/snap/okular/63/.config/okularpartrc

It is a printable file. All annotation marker pen definitions follow the heading

[Reviews]
AnnotationTools=

and follow e.g. this pattern

<tool name="rot 25" id="5" type="highlight"><engine color="#ffff0000" type="TextSelector"><annotation color="#ffff0000" type="Highlight" opacity="0.25"/></engine><shortcut>5</shortcut></tool>