[WikimediaMobile] Dropping position:fixed from the header bar?

[Brion Vibber]

The floating, fixed-position header bar (header bar always at the same
place at top of the screen while other things scroll) causes a number of
problems in the app, including:

* https://bugzilla.wikimedia.org/show_bug.cgi?id=32917 - It's difficult to
tap into the search box
* https://bugzilla.wikimedia.org/show_bug.cgi?id=31524 - section links on
file pages scroll too far down

My 'absolute' branch resolves this by removing the 'position: fixed'
floating toolbar and letting it scroll off the page:
https://github.com/brion/Wikipedia/commits/absolute

This lets us drop the event handlers that screw up the search field
focusing, because we don't need them to work around the bug where click
events went through to the background elements. It fixes the scrolling /
reference / hashlink issue by getting the header out of the way, so going
to a position in the document actually shows it at the top of the screen.

It also provides more screen space for reading, which is a big plus in
portrait orientation where a toolbar eats proportionately more screen space.


The downside is that if you've scrolled down on the page, you have to
scroll back up to get to the search field etc.

This is pretty much how the stock web browsers on iOS and Android work,
however, so I don't think it's such an awful thing to do. Any objections?
Preferences on making things sometimes auto-pop up?

-- brion
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