Add vertical scrollbar to html tag to avoid page jumps

[zodiac1978]

If you have a rosetta webpage which is not very long, maybe you have no vertical scrollbar.

Changing from long page to short page now leads to a "jumping" page (with or without the scrollbar).

Let's add a vertical scrollbar everytime (like in Twenty Fifteen):
​https://github.com/WordPress/WordPress/blob/master/wp-content/themes/twentyfifteen/style.css#L79

[ocean90]

There are still browsers which don't add scrollbars as an overlay? :(

Why only for international sites?

[zodiac1978]

Replying to ocean90:

There are still browsers which don't add scrollbars as an overlay? :(

I'm using the newest Firefox 43.0.4 and there is the problem showing.

Why only for international sites?

Don't know: One bug per ticket/component? ;)

Which sites should I check for this problem, too?

[ocean90]

Replying to zodiac1978:

Which sites should I check for this problem, too?

All? :)

I think the proper place for that would be sites/trunk/wordpress.org/public_html/style/wp4.css​.

[zodiac1978]

Modification is now in sites/trunk/wordpress.org/public_html/style/wp4.css

[zodiac1978]

Replying to ocean90:

Replying to zodiac1978:
I think the proper place for that would be sites/trunk/wordpress.org/public_html/style/wp4.css​.

I've used the reset area in the beginning of the css file. Seems right for me. What do you think?

[ocean90]

In 2390:

wp4.css: Avoid "jumps" when navigating between short and long pages.

Props zodiac1978.
Fixes #1532.