With the new Air theme, the scrollbar in the Add Widgets applet is almost invisible. After it is moved with the mouse it gets a light blue halo which makes it better to see but it's still difficult. Reproducible: Always See screenshot
Created attachment 75781 [details] the visual bug
It is also a bad thing it doesnt have Up/Down or Left/Right buttons. In Oxygen you can configure this behavior but Plasma just uses its theme and that's it.
Created attachment 76437 [details] difficult to read due to transparency Consider that transparent background makes difficult to read the writing, in my example was trying to add a widget. I think that usability suffers a lot.
i'm torn as to what to do here. the experiment with the horizontal strip is not a successful one. i don't think making the scrollbar behave in a non-standard way or making the scrollbar so overt that it ruins the other areas of the interface where it is used are great solutions. i'd rather see a re-think of this component in general that does not rely on such things in the first place. as such, i'm going to mark this as WONTFIX. not because i think this isn't a problem, but because i don't think this is the symptom to address. @Kai: sorry, arrows won't be appearing in the desktop shell UI scroll bars. try placing them everywhere to see why this is horrible visually and lends little if any benefit in most places in the shell. @Marco Menard: the blur effect is not working for you, which blurs the behind the windows. this makes the text very readable. also, please try to keep bug reports about one thing at a time :)