Rev 1386 contains the fix to the hard crashes taken when searching for
a string that appears in an invisible node.

To make this work, I added several calls to c.redraw_after_expand or
c.redraw_now to Leo's core.  This has the potential to cause the Tk
tree code to do some additional redraws.  I'll have to check that this
isn't too odious...

Please use care with the new code.  It needs more testing.

The to-do list contains the latest urgent items.  They are urgent
because annoying, but they should not be dangerous.

Edward
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