Always show scrollbar in persistence setup wizard

Originally created by @segfault on #15784 (Redmine)

I find that with the new scrolled window, it doesn’t seem obvious that there are more settings below the ones visible at first, especially if the height of the visible rows incidentally aligns with the height of the scrolled window (so that it looks complete).

I know that there are already two indicators:

• A very thin dashed line at the bottom of the scrolled window
• A scrollbar indicator which auto-hides 3 seconds after the window was opened / the mouse cursor left the scrolled window

I find these existing indicators too subtle, so I propose we just always show the scrollbar, using the “overlay-scrolling” property . I think it would be even better to always show the thin scrollbar indicator, but that doesn’t seem to be possible.

Feature Branch: segfault3:feature/15784-always-show-scrollbar

Parent Task: #14568 (closed)

Related issues

• Related to #14595 (closed)
• Related to #15117 (closed)
• Related to #15769 (closed)