Fixes embarrassing bugs in Rich Editor Demo: - File -> Save not saving - File -> Open not emphasizing .rich files
------------- Commit messages: - save Changes: https://git.openjdk.org/jfx/pull/1739/files Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1739&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8352268 Stats: 17 lines in 1 file changed: 6 ins; 4 del; 7 mod Patch: https://git.openjdk.org/jfx/pull/1739.diff Fetch: git fetch https://git.openjdk.org/jfx.git pull/1739/head:pull/1739 PR: https://git.openjdk.org/jfx/pull/1739
