Add a 'pre-dependencies-load' hook.

Let's see what the test-bot says this time. This looks good to go!

In a follow-up we should add dedicated tests for the new callback group. Because the previous patches demonstrate that we have sufficient test coverage, and, thus, that this patch doesn't break anything, and because @Pol needs this for OpenLayers, I will commit the patch as is, instead of requiring the tests now. If now one beats me to it, I will provide some tests. (Should be mostly copy-paste.)

Here we go. This includes test-coverage, which was (even) easier than I expected.

Thanks! I'll commit this later.

In case @sun is following along at home, I plan to release a new version with this commit, because @Pol needs it for OpenLayers.

Pre commit I fixed the trailing whitespace and also added an example pre-dependencies-load callback to the example library.

Committed this to 7.x-2.x
http://drupalcode.org/project/libraries.git/commit/7d2a3db42f7553dca65e6...

#1938638: Cached libraries (with corrupt data structure) are being loaded on update.php before the update from 2.0 to 2.1 may be introduced by this patch.

This was never committed to 7.x-3.x

Did so now: http://drupalcode.org/project/libraries.git/commit/bc29efec5073d93bde93d...