[xunguangzlj-cloud]

Description

Split the hx-swap-oob="swapStyle:selector" shorthand at the first colon. The greedy match split at a later colon in selectors like .target:not(.skip) and [data-key="a:b"], so htmx passed an invalid selector to the browser and abandoned the swap.

The existing target: modifier and shorthand selectors with spaces still work.

Corresponding report: #4199 (comment)

Testing

• Added two browser regressions for a pseudo-class and a colon in a quoted attribute selector. Both fail on four-dev at ec5a055 and pass with this change.
• Served both responses over loopback HTTP in Chromium and Firefox. The regular swap and the selected out-of-band target update, and the excluded element keeps its original text.
• Web Test Runner: Chromium 1,853 passed, 4 skipped. Firefox 1,846 passed, 9 skipped, with one test-page startup timeout in hx-post.js. Reran that file and hx-swap-oob.js in Firefox: 16 passed.
• git diff --check passed.

Checklist

• I have read the contribution guidelines
• I have targeted the htmx 4 development branch (four-dev)
• This is a bugfix
• I ran the test suite locally