Twenty Fifteen: Child menu items aren't reachable in some cases.

[iamtakashi]

When a page is like this: (The sidebar is shorter than viewport and fixed, and the main content is also shorter than the viewport)

If you have a lot child menu items and if you expand the menu to display them:

There is no way to reach child menu items at the bottom.

[obenland]

I can't reproduce. In my tests it's scrollable and I can scroll down to those items.

[iamtakashi]

Replying to obenland:

I can't reproduce. In my tests it's scrollable and I can scroll down to those items.

That's weird. It's happening to me on both Chrome and Firefox on Mac.

What inline style do you have on .sidebar initially? It should be position: fixed.

And then when you expand the menu and the sidebar length exceeds your browser window, does the style change?

[iamtakashi]

Anyway, I tweaked a little the conditions in the scroll function and it seems to work well as far as I tested.

[lancewillett]

In 30838:

Twenty Fifteen: update scroll functionality to make sure child menu items are always reachable.

Props iamtakashi, fixes #30674.

[SergeyBiryukov]

In 30938:

Twenty Fifteen: update scroll functionality to make sure child menu items are always reachable.

Merges [30838] to the 4.1 branch.

props iamtakashi.
see #30674.