Fix for #3773: Show Indexing Max Files Exceeded Error Dialog once

fixes issue #3773.  minor fix to only show dialog "Error Indexing Files" "The maximum number of files have been indexed. Actions that look up files in the index may function incorrectly."   The problem is if your current project has > 10k files you see this error every time you save an edit and dirty the cache.  The fix is to show to error the first infraction and  use console.log subsequent times.