Bug 575893 - [performance] improve file search: non-regexp

Use Pattern.quote for non-wildcards in non-regexp search 
instead of escaping each single character.

Change-Id: I061506448cdde5ab17ad1b9c551111472acf47eb
Signed-off-by: Joerg Kubitz <jkubitz-eclipse@gmx.de>
Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.text/+/185193
Tested-by: Platform Bot <platform-bot@eclipse.org>
Reviewed-by: Lars Vogel <Lars.Vogel@vogella.com>
2 files changed