Cause: When slider is dragged for first time after tooltip appears, setOnMousePressed event was not invoked, hence dragStart was null in the subsequently invoked event handler (setOnMouseDragged).
Fix: Initialized dragStart in initialize method. Test: Added system test to validate the fix. Note: Initializing dragStart in layoutChildren method as suggested in the bug was causing side effects. Hence initialized dragStart in initialize method. ------------- Commit messages: - Correct file permissions - Correct line endings - Merge branch 'master' into slider_npe_fix - SliderSkin NPE fix Changes: https://git.openjdk.org/jfx/pull/965/files Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=965&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8190411 Stats: 152 lines in 2 files changed: 152 ins; 0 del; 0 mod Patch: https://git.openjdk.org/jfx/pull/965.diff Fetch: git fetch https://git.openjdk.org/jfx pull/965/head:pull/965 PR: https://git.openjdk.org/jfx/pull/965
