file quick rename - don't auto select file's extension
When using the "quick rename" function, the entire file name text including the extension is automatically selected (in blue).
When you rename a file using Windows Explorer, only the file's base name text is auto selected.
e.g., renaming "Great Movie.avi" would only auto-select the text "Great Movie"
likewise if the "add suffix to incomplete files" option is used, "Great Movie.avi.az!" only auto-select the text "Great Movie"