hgview #7659 "searching" widget when doing a search [validation pending]

When doing a search on a big repository, it is not always apparent that hgview is doing something. If you move the mouse around then you can see that it is doing something (the cursor turns to "busy"), but since the cursor doesn't show because you are on the textarea there should be another indicator (like the loading tab in firefox?)

appeared in<not specified>
done in1.0.0
load left0.000
closed by<not specified>