After re-writing the data, make sure nothing is selected before refreshing the tree view.
(Fixes issue #365) : Crash when after modifying the ignore users
A click on the tray icon now first brings the window to the front if it's covered. The dialog is only closed if it's in the front.
(Closes issue #362) : Feature request for the tray icon single click
New function to check whether a window is covered by other windows. The function does this by checking 100 different points of the window.
Update issue #362