[issue3143] Make the left sidebar in the doc collapsible

[Ezio Melotti]

Ezio Melotti <ezio.melotti at gmail.com> added the comment:

Here's a new version. Now it works with all the major browsers and it's
more usable.

I tested it on the following browsers, and I didn't notice any problem/bug:
Firefox 2.0/3.0/3.5;
Internet Explorer 6/7/8;
Opera 9.64;
Chrome 2.0;
Konqueror 4.2.2;
Seamonkey 1.1;

I also tested it on a Nokia 5800, where the sidebar normally takes more
than half of the screen or about 1/3 if the phone is in landscape mode
(its screen resolution is 640x360, the sidebar is 230px).
With the built-in browser it works fine, but it's quite slow (8-9
seconds to collapse and a few more seconds to expand).
With Opera Mini it has some problem: when the sidebar is collapsed the
page is reloaded and the only way to expand it again is to use the
'back' button.

A few things could be improved:
  * Add some "effects" to the button on hover (to show that it is
clickable) and on click (to show that it was clicked);
  * Remember the position of the sidebar (collapsed/expanded) in all the
pages of the doc (using a cookie?);
  * Make it faster (although I think that most of the time is spent
rendering the page, so there's probably nothing to do).

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Added file: http://bugs.python.org/file14799/sidebar.js

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