TabContainer: add horizontal scrollbar to tab list

[DwightM]

Currently the Tab buttons at the top drop to the next horizontal line if they overflow the width of the container.

Would it be possible to have a scrollbar here like the extjs version?

​http://www.extjs.com/deploy/dev/examples/tabs/tabs-adv.html

PageFlakes? also has similar functionality:

​http://www.pageflakes.com/

This would allow for more consistent design usage.

[bill]

Yah, we talk about this often, either a scroll bar or a menu to show the tab labels that don't fit on the first row. Either that or a menu. Just no one has volunteered to do it yet.

I thought there was already an open ticket for this but can't find it now.

[dante]

I thought this was a dup too, but maybe it's just one of those we know we want eventually. I'll take this. Secretly hope to have something around it for 1.3, but no promises.

[dante]

+1 ... closing this out in light of patch on #7888 which adds this support (to 1.1 only, needs updating to 1.2)