Having variables initialised from start `_isTransitioning` is better.
Would be better to add an eslint rule to check for undeclared variables use.
Reordered enter checks for `show` and `hide` by priority.

* update docs path from docs/4.0/ to docs/4.1/

* bump version to 4.1.0

* Update redirects to work for 4.1 docs move

* Update docs version switcher to include latest and link to 4.0 docs

* re-run dist

* Update package-lock.json

* Update docs-navbar.html

This variable is not used anywhere.

Leftover from #18373.

Fix for issue #24117

_adjustDialog should be called when the modal is first displayed to prevent it jumping position when the viewport is resized

Prevents the test from failing

* Adjust margin for sticky elements on modal

Previously white space was visible to the right of sticky elements due to right padding being added to the body. This fixes #23661.

* Add unit tests for margin of sticky elements on modal

ESC can be used to close modals, but on OS X/macOS this also jumps out
of full-screen mode. `preventDefault` suppresses this.