Thanks to a patch from John Simons (he contributed an implementation for the necessary JScript Gobals object), SharpDevelop2 can now persist the Html Help settings. An example for the settings are the language filters - the below screenshot shows the default way a topic is being displayed:

Information on syntax and usage is displayed for all languages, which in most cases is inappropriate. So you can adapt the filter to your programming language preferences:

You could do that before revision 1058 too, however, upon closing and reopening (even the help browser), the language filter settings would have been lost. Now, this no longer happens (screenshot is after a restart, you simply have to trust me on this one - or even better, try the daily builds):

A seemingly small improvement, but I am sure that many developers will appreciate the effort that went into it!