Bug 120243 - Remove old idle workaround

Bug link -
https://bugs.documentfoundation.org/show_bug.cgi?id=120243#add_comment

Hello, I'm new to open source. I want to solve this bug. I went through
condformatdlg.cxx, I also read few articles related and I think making
changes in class ScCondFormatList will do the work and this is because the
name of the class is intuitive. But I don’t know what to do from here.
Please guide me for the same.

Thank you.