[5.1] Fix user field validation on change

[C-Lodder]

Summary of Changes

This PR fixes error validation on a "User" field when a user is selected.

Testing Instructions

1. Got to administrator/index.php?option=com_messages&view=messages
2. Click "New"
3. Focus on the "Recipient" user input field
4. Focus away from the "Recipient" user input field (you'll see a red error message)
5. Select a user

Actual result BEFORE applying this Pull Request

Field remained red with the error message

Expected result AFTER applying this Pull Request

Error message is removed and field border turns green

[dgrammatiko]

I wouldn't add another listener into the validate.js.
FWIW you can fix this issue by replacing this

joomla-cms/build/media_source/system/js/fields/joomla-field-user.w-c.es6.js

Lines 142 to 146 in 4e6d9ea

	dialog.addEventListener('joomla-dialog:close', () => {
	window.removeEventListener('message', msgListener);
	dialog.destroy();
	this.dialog = null;
	});

with this:

    dialog.addEventListener('joomla-dialog:close', () => {
      window.removeEventListener('message', msgListener);
      dialog.destroy();
      this.dialog = null;
      this.inputName.focus();
      this.buttonSelect.focus();
    });

Basically it's a focus delegation problem...

[ghost]

I have tested this item ✅ successfully on 57babee

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[viocassel]

I have tested this item ✅ successfully on 0dabe82

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[ghost]

I have tested this item ✅ successfully on 0dabe82

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/42756.}

[Quy]

RTC

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[crimle]

I have tested this item 🔴 unsuccessfully on dc0db7f

Pressing the button {Apply Patch] results in error message
There are no files to patch from this pull request. This may mean that the files in the pull request are not present in your installation.

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[Nuyonuyonoina]

"Apply patch" button doesn't work. Error message is "There are no files to patch from this pull request. This may mean that the files in the pull request are not present in your installation."

[eddiekonczal]

I have tested this item 🔴 unsuccessfully on dc0db7f

When I try to install the patch, I get this error:

"There are no files to patch from this pull request. This may mean that the files in the pull request are not present in your installation."

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/42756.}

[richard67]

@crimle @Nuyonuyonoina @eddiekonczal I will reset the negative test results as they are not caused by this PR. The PR modifies an NPM dependency, which can be seen by the label "NPM Resource Changed". Such PRs can't be tested with Patchtester, they require either a development environment with composer and NPM, or they need to be applied by using the packages created by drone, which can be found in the "Downloads" section of the integration checks at the bottom of the PR.

[bembelimen]

Thx