EPE-2 Overview Window "Over" Refreshing

The overview window was excessively refreshing during a syntax check/compile.

Fixes EPE-2

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Merge pull request #93 from GordonSmith/EPE-2

EPE-2 Overview Window "Over" Refreshing

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>