Scroll bar indicator shrinks too much with long files.

[XV-02]

When loading sufficiently long files such as system logs, the vertical scroll bar's position indicator can shrink to a single pixel in height in cosmic-edit (fb151fd).

To test this, I opened the saved output of journalctl in cosmic-edit. In my case this was a 60K+ line file.

Strictly speaking you can arbitrarily click into the scroll bar to move to a position within a document and subsequently drag to scroll without issue. However, not having a clear and clickable drag point can cause two issues: making the scroll bar itself non-obvious; and making it difficult to scroll a controlled amount in a long file, as you have to click with pixel accuracy to avoid content jumping.

[emkkla]

A bit bit off-topic but not entirely: Why not replacing the classic scroll bar with a code minimap scroller ?
KDE Kate does that, and I think it's a great idea.
It combines scrolling, global code preview, and is easier to navigate by increasing the clickable area for the mouse.