When the datepicker UI is shown and then destroyed programmatically:
```js
$( "#datepicker" ).datepicker( "destroy" );
```
hide the datepicker UI without the need for an explicit user action.
Previously, in 1.12 the UI would not disappear immediately but only after the
first `mousedown`. In later 1.13 versions, the UI would not disappear at all.
Fixes gh-2178
Closes gh-2268
Changes:
* add `tests/lib/vendor/**/*` to `.eslintignore`
* move `qunit-composite` to `tests/lib` so that we can modify it
* move `qunit-assert-classes` to `tests/lib` so that we can modify it
* move `qunit-assert-close` to `tests/lib` so that we can modify it
* replace `assert.push` with `assert.pushResult`
* remove usage of `QUnit.extend`
Closes gh-2157
The docs say that valid periods when using string value and
period pairs as relative dates are "y", "m", "w", and "d"
https://api.jqueryui.com/datepicker/
Closes gh-2143
Add a new option named onUpdateDatepicker that allows a custom callback
to be provided. If provided, the callback is called at the end of
$.datepicker._updateDatepicker.
Instead of using enormous HTML strings, various elements are now constructed
using jQuery APIs. This makes it more obvious user-provided data is used
correctly.
Fixes#15284
Closes gh-1953
This helps fix issues that make tooltip tests sometimes fail when run against
jQuery 3.2 or newer due to timing differences.
Details:
* Add the `moduleAfterEach` function ensuring no timers are running.
* Attach this function via `common.testWidget`.
* Attach this function to most test suites.
* Add a tooltip test helper cleaning up leftover timers.
* Rename legacy `setup`/`teardown` hooks to `beforeEach`/`afterEach`.
Closes gh-1920
jQuery positional selectors () have been deprecated in
[jQuery 3.4.0](https://blog.jquery.com/2019/04/10/jquery-3-4-0-released/)
and they'll be removed in jQuery 4.0.0. This PR removes their usage.
Most of the changes were possible without changing public API. However,
dropping `:even` usage required a change to the
[`header` option](https://api.jqueryui.com/accordion/#option-header)
of the accordion widget. I made it an optional function; this will need
to be documented.
The polyfill for `.even()` & `.odd()` is added for jQuery <3.5.0. There was
no usage of the :odd selector in the code but the `.odd()` method is also
polyfilled for completeness.
Closes gh-1904
