Windows set to skip tasklists still show up

[5aurabhpathak]

This problem goes away when cinnamon is restarted again. I peeked a bit into the code of js/ui/main.js where
function isInteresting(metawindow)
somehow returns true for the code even when the window is set to skip tasklist and "should not be interesting" according to the code in Cinnamon.WindowTracker.c. The following lines in main.js return the true value.
if (tracker.is_window_interesting(metaWindow)) { //this should evaluate to false for skip tasklisters
// The nominal case.
return true;
}
However when cinnamon is restarted using -HUP the code behaves as intended and skips the task list for the non interesting window.