Lazy directory loading doesn't work with Internet Explorer

[Nicklas Nordborg]

Using Internet explorer 8.

1. Go to View -> Files.
2. Try expand a directory that hasn't had it's children loaded yet. Eg. the 'plus' icon should be a little grayish.
3. The child directories are loaded, but only one child entry is created in the directory structure. The name of the entry is a concatenated, comma-separated, list of the real child directory names. Eg. if there are 3 children (a, b and c) the entry is 'a,b,c'.

Clicking on the incorrect entry will show the contents of the first child directory in the right-hand frame. Trying to expand the new entry by clicking on the 'plus' icon results in a javascript error:

Message: 'index' is null or not an object
Line: 97
Char: 4
Code: 0

[Nicklas Nordborg]

(In [5157]) Fixes #1415: Lazy directory loading doesn't work with Internet Explorer

[Nicklas Nordborg]

#1413 includes the same fix for the trunk. There should not be any merge problems later since the fix is identical in both places.