Fix loading iframe in modal (issue reported here https://github.com/j…

[cyrezdev]

Pull Request for Issue reported by @roland-d : #10557 (comment).

When I click the Edit button the modal comes up and I first see the article list which then changes to the edit page.
Why is the article list shown before the edit screen? I would expect the edit screen without seeing the article list first.

Summary of Changes

• When an iframe is loaded inside a modal, this one is destroyed first and then reloaded to use then Jlayout modal iframe, but it could return the issue reported (see Testing Instructions before patch, or @roland-d comment above) when the script is included in modal event handler "shown".
• Adding the iframe rendering inside a "show" event (before the modal has been made visible to the user), solves this issue.

Testing Instructions

Before Patch:

• Open any Edit modal (article, category, module, contact, newsfeed) : can be found in menu item type "Single ****" or in association tab of article, category, newsfeed, contact edit page
• After click on "Edit" button (the layout loads directly) click on "Close"
• Then click again on "Edit" button, and you may see the list view 1/2 second before the edit layout loads.

After Patch:

• Do the same: the edit layout loads each time directly, and the list (contacts, articles...) does not show up anymore before edit view

[infograf768]

I have tested this item ✅ successfully on 6ded0a7

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_{This comment was created with the J!Tracker Application at issues.joomla.org/joomla-cms/10560.}

[pete-rossetti]

Yup have tested this patch successfully - the delay in filling the modal is removed

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_{This comment was created with the J!Tracker Application at issues.joomla.org/joomla-cms/10560.}

[brianteeman]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/joomla-cms/10560.}

[zero-24]

@brianteeman @roland-d can we get the milestone here?

[brianteeman]

Done