1157431 - The thumb on an overlay scrollbar disappears when scrolling in a small textarea

Status: NEW

(Core :: Layout, defect)

Description

[Simon Montagu :smontagu]

Attachment: Testcase

With overlay scrollbars turned on, scrolling down in a textarea with only two lines makes the scrollbar thumb gradually shrink and disappear. Resizing the textarea makes it reappear again.

Comment 1

[Markus Stange [:mstange]]

I think this is by design, but I've forgotten where it's implemented. This probably looks at the minimum size of the thumb. The thumb's minimum size is fairly large because at the time overlay scrollbars were implemented, OS X couldn't draw them any smaller - if you asked for something smaller, it would just draw at the larger minimum size and overflow your draw rect.

Comment 2

[Simon Montagu :smontagu]

I could understand that if there was *never* a thumb in a small textarea, but the testcase starts out with a fine-looking thumb which gets gradually smaller while scrolling down until it disappears completely.

Comment 3

[Markus Stange [:mstange]]

Huh, okay, that's weird.