Fixes the Quick Open integration test (#2696).

Note that I did sometimes see failures, but these appeared to be
genuine failures (as in the scroll position was not correct in the
window on screen).
Fix exception when _noMatchCache contains the 'hasOwnProperty' property
Make the test more resilient with a wider band.

Rather than +/- 1 on the offset, use 40%-60% of the height.
remove extraneous comment.
Merge pull request #3415 from adobe/dangoor/2696-once-and-for-all

Fixes the Quick Open integration test (#2696).
Use CollectionUtils.hasProperty()
Merge pull request #3417 from dloverin/StringMatchCacheFix

Fix exception when _noMatchCache contains the 'hasOwnProperty' property
Update jsdoc comments in package-validator.

Per review comment during brackets-registry work.
Update labels to sprint 24.
Merge pull request #3425 from adobe/rlim/update-sprint-to-24

Update labels to sprint 24.
update CodeMirror SHA
Merge remote-tracking branch 'upstream/master'