This is a version of gh-4993 for the `3.x-stable` branch.
The GitHub UI treats `#NUMBER` as referring to its own issues which is confusing
when in jQuery source it's usually referring to the old deprecated Trac instance
at https://bugs.jquery.com. This change replaces all such Trac references with
`trac-NUMBER`.
A few of the references came with the Sizzle integration and referred to the
Sizzle GitHub bug tracker. Those have been replaced with full links instead.
A new entry describing issue reference conventions has been added to README.
Closes gh-4994
Ref gh-4993
Ref 5d5ea01511
1. Correct code indentations based on jQuery Style Guide
(contribute.jquery.org/style-guide/js/#spacing).
2. Add rules to "src/.eslintrc.json" to enable "enforcing consistent
indentation", with minimal changes to the current code.
Closes gh-4672
(cherry picked from 3d62d57049)
The new regex from after the switch from JSHint to ESLint wasn't catching
the ESLint pragma correctly.
Also, the spacing of the pragma comment was updated to match other comments.
