Question about Bug 402110

[stevengkc714]

Hello. I'm new to contributing to KDE and I want to work on this issue in 
Okular: https://bugs.kde.org/show_bug.cgi?id=402110. The issue mentions 
changing the table select tool so that it only copies to the clipboard after 
pressing Ctrl+C. Where in the code would be a good place to implement this? 
Thanks in advance.