[mylar-dev] patch for performance improvements and group actions on task

[Eugene Kuleshov <eu@xxxxxxxx>]

Hi all,

 I get annoyed by slow UI responsiveness when group actions are called 
on Task List (mark read, completed, schedule..., etc). More over group 
actions aren't enabled for local and web tasks...

 So, after looking at these issues I again come up with quite big 
patch. Apparently I am unable to produce the small ones and have to beg 
to review and apply them, so they won't get into conflicts with ongoing 
changes.

 Patch attached to issue 165732 adds canRead() and canComplete() 
methods to ITaskListElement and moves other methods like isCompleted() 
up to class hierarchy. Logic for mark read/unread and complete actions 
became much simpler and group actions now work for local and web tasks.
 Another improvement that worth to note is moving task saving (which 
takes 2..3 seconds here) into the background job, so it don't block the 
UI anymore and as a side effect skips lots of sequential save requests. 
With this change I observe significant improvement in UI and task saving 
operations.

 See https://bugs.eclipse.org/bugs/show_bug.cgi?id=165732

 I hope Mik or Rob can review this and apply this patch before it get 
stale.

 regards,
 Eugene