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Jan Heylen

diff: get collapse target via .attr instead of .prop

Commit 3f017db297c4 was not fully tested and broke collapse/expand of diffs on
changesets. $button is not a link with a target and the target can thus not be
retrieved with .prop('target'); $button is just a span that happens to have a
custom attribute with the name 'target'.

We thus revert back to the old way of retrieving it with .attr('target'). (It
would perhaps be even better to use data attributes and name it data-target and
use .data('target') ...)

.. _debugging:

===================
Debugging Kallithea
===================

If you encounter problems with Kallithea, here are some instructions
on how to debug them.

.. note:: First make sure you're using the latest version available.


Enable detailed debug
---------------------

Kallithea uses the standard Python ``logging`` module to log its output.
By default only loggers with ``INFO`` level are displayed. To enable full output
change ``level = DEBUG`` for all logging handlers in the currently used .ini file.
This change will allow you to see much more detailed output in the log file or
console. This generally helps a lot to track issues.


Enable interactive debug mode
-----------------------------

To enable interactive debug mode simply comment out ``set debug = false`` in
the .ini file. This will trigger an interactive debugger each time
there is an error in the browser, or send a http link if an error occured in the backend. This
is a great tool for fast debugging as you get a handy Python console right
in the web view.

.. warning:: NEVER ENABLE THIS ON PRODUCTION! The interactive console
             can be a serious security threat to your system.