Open help tab lags if screen options was opened before

[ocean90]

Originally reported by duck_ in IRC:

duck_: has anyone else noticed the lag if you open Screen Options, close it and then open Help?

MarkJaquith: duck_: yeah, I see a very slight hiccup there (Chrome)

Removing screenMeta.refresh(); removes the lag.

[nacin]

We need something there, otherwise the bug that was fixed by [19045] would return.

Basically, if there is a greater vertical height of the help tabs than the content in the initial tab, the white background doesn't extend to the bottom.

[azaozz]

Replying to nacin:

Yes, screenMeta.refresh(); is a JS "hack" to fix a css deficiency. There's no reason for it to draw so much CPU cycles, will look into it.

[azaozz]

In [19186]:

Fix lag when opening help tab if screen options was opened before, fixes #19172