3.5.0 - fix clicking into iframe after interaction with AUT

[kuceb]

• needed a check for .ownerDocument when deciding whether to send mouse leave events to an element

• Closes 3.5.0 - CypressError: Timed out retrying: Cannot read property 'defaultView' of null #5449

• includes link to issue

• move test into click_spec

User facing changelog

bug fix: fixed issue preventing users from using .click or .type inside an iframe element.

Additional details

How has the user experience changed?

When trying to click or type into an iframe, the test will no longer fail with CypressError: cannot read propery defaultView of null

PR Tasks

• Have tests been added/updated?
• [NA] Has a PR for user-facing changes been opened in cypress-documentation?
• [NA] Have API changes been updated in the type definitions?
• [NA] Have new configuration options been added to the cypress.schema.json?

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PR Review Checklist

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User Experience

• The feature/bugfix is self-documenting from within the product.
• The change provides the end user with a way to fix their problem (no dead ends).

Functionality

• The code works and performs its intended function with the correct logic.
• Performance has been factored in (for example, the code cleans up after itself to not cause memory leaks).
• The code guards against edge cases and invalid input and has tests to cover it.

Maintainability

• The code is readable (too many nested 'if's are a bad sign).
• Names used for variables, methods, etc, clearly describe their function.
• The code is easy to understood and there are relevant comments explaining.
• New algorithms are documented in the code with link(s) to external docs (flowcharts, w3c, chrome, firefox).
• There are comments containing link(s) to the addressed issue (in tests and code).

Quality

• The change does not reimplement code.
• There's not a module from the ecosystem that should be used instead.
• There is no redundant or duplicate code.
• There are no irrelevant comments left in the code.
• Tests are testing the code’s intended functionality in the best way possible.

Internal

• The original issue has been tagged with a release in ZenHub.

[jennifer-shehane]

I confirmed this fixes the issue of trying to click or type into an input within an iframe so that it no longer throws.