问题
How to change breadcrumbs background color on crumb hover?
回答1:
It appears that it uses the same color as "Caret Row" style .. and just automatically makes it lighter (darker the color the bigger difference will be):
回答2:
As the breadcrumb changed appearance in 2017.2, this can now also be configured better. Go to File > Settings > Editor > General > Breadcrumbs (Windows/Linux) or PhpStorm > Preferences > Editor > General > Breadcrumbs for macOS. There you can press "Manage colors" to get to the options pictured above.
https://www.jetbrains.com/help/phpstorm/navigating-with-breadcrumbs.html
回答3:
This effect currently not disable.
Related issue: https://youtrack.jetbrains.com/issue/IDEA-139930
来源：https://stackoverflow.com/questions/30107954/how-to-change-breadcrumbs-highlight-background-color-in-phpstorm