[Forwardport][2.3] of MAGETWO-93818: Magnifier function does not disappear after mouse-off the image from the bottom

[gwharton]

Original PR/Commit

c55480e#diff-a3d63022f922ef08dd75e31dddb0025a

This PR replicates the MAGETWO-93818 change into 2.3-develop

Description (*)

Magnifier function does not disappear after mouse-off the image from the bottom
This PR adds the onMouseLeave event

Fixed Issues (if relevant)

1. [2.2.4] Gallery Magnifier hover event does not always cancel magnifier when mouse leaves gallery #15035: [2.2.4] Gallery Magnifier hover event does not always cancel magnifier when mouse leaves gallery

Manual testing scenarios (*)

1. Enable magnifier zoom in themes view.xml

        <var name="magnifier">
            <var name="fullscreenzoom">20</var>  <!-- Zoom for fullscreen (integer)-->
            <var name="top"></var> <!-- Top position of magnifier -->
            <var name="left"></var> <!-- Left position of magnifier -->
            <var name="width"></var> <!-- Width of magnifier block -->
            <var name="height"></var> <!-- Height of magnifier block -->
            <var name="eventType">hover</var> <!-- Action that atcivates zoom (hover/click) -->
            <var name="enabled">true</var> <!-- Turn on/off magnifier (true/false) -->
            <var name="mode">outside</var> <!-- Zoom type (outside/inside) -->
        </var>

2. Ensure that the magnifier cancels the zoom window when your mouse pointer leaves the product image.

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[magento-engcom-team]

Hi @gwharton. Thank you for your contribution
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[magento-engcom-team]

Hi @VladimirZaets, thank you for the review.
ENGCOM-3224 has been created to process this Pull Request

[gwharton]

@VladimirZaets sorry, I missed a whitespace issue that would result in a test fail. Just updated.

[magento-engcom-team]

Hi @gwharton. Thank you for your contribution.
We will aim to release these changes as part of 2.3.1.
Please check the release notes for final confirmation.