* Add the option to use FormData to encode the form elements
If the form's enctype attribute is set to "multipart/form-data",
use FormData to encode the form's elements.
Instead of cloning this.options again in handle-response.js, pass the options object from send-request.js. This way, pjax.state.options will also have the request options.
* Fix bug when checking if elements were parsed already
parse-element.js checks if the element was already parsed by
checking for the `data-pjax-click-state` attribute. However, this
attribute was not added until the link is clicked.
Originally, there was a separate attribute, `data-pjax-enabled`,
which tracked if the element was parsed already, but that was
changed in 9a86044.
This commit merges the attributes for mouse clicks and key presses
into one and adds that attribute when the element is initially
parsed.
* More bug fixes
* Fix documentation for currentUrlFullReload
* Ignore lines from coverage if they can't be tested
* Refactor attach-link and attach-form
* Fix and refactors tests
* Add tests
* Add TS definitions for options.requestOptions
* Code cleanup
