WebFM ajax calls fails if Browser responseText contains leading whitespace / line feeds.

Issue Summary

WebFM was not working correctly on my Windows development box (Windows XP, Apache 2.2, MySQL, PhP... installed individually). The main symptoms were:

- Only file box shown (right side) with no folders box.
- Files would upload but go to the Drupal upload directory and not to the WebFM root

This occured both in FF 3.5 and IE 7.

After splunking around for a day or so, I finally found the problem in webfm.js. The XMLHttpRequest object was returning a response string that started with 2 or 3 linefeed (0x10) characters. This was breaking the conversion to JSON.

Note that debug output did not show these... you have to get the character code to see them.

Anyway, the solution was to modify the Webfm.HTTPPost function so that xmlHttp.responseText was wrapped in a Webfm.trim(..) call.

Specifically, in the js/webfm.js file, change lines 3743 and 3749 to look like the ones below:

3743: callbackFunction(Webfm.trim(xmlHttp.responseText), xmlHttp, callbackParameter);

3749: return Webfm.trim(xmlHttp.responseText);

FWIW - In researching this, I saw several issues talking about Windows installs not working in various manners. I suspect this fix will solve a lot of these.