Scroll bars disappearing when switching from different application

[scholtzan]

When switching to xi from another application the scroll bars don't appear when scrolling:

Once the editor window is resized or some text is inserted the scroll bars will reappear when scrolling.

[nangtrongvuon]

This is directly caused by a fix I merged a few weeks prior. Why this happens is the ScrollView looks for the scroll method to show the scroller. I have however overriden this scroll method to instead set the bounds origin directly.

I'm not sure what triggers the appearance of the scrollers in scroll, but this bug would be fixed if I am able to replicate that.

[cmyr]

@nangtrongvuon can you call super in your implementation of scroll? I'd check the docs and see what they say about this, but it could be the problem.

[nangtrongvuon]

Actually, I’ve been doing that and the problem is a little bit trickier. Simply calling `super` will make the scroll bar very jerky. There’s a hacky fix that I came up with (which is to call `setBoundsOrigin` twice) but I suspect the real fix may be to get xi-mac to render continuously properly on scrolls, but I’m not quite sure how to do that yet.