[11.x] Fix EncodedHtmlString to ignore instance of HtmlString

[jbraband]

I do not see existing tests for the sub-mail components (header, footer, table, etc) and so are excluded from this PR. The related PR #55149 also do not contain tests for similar changes to button, header, layout, message, and panel.

---

After updating to Laravel 11.44.3 yesterday, the mail components started rendering escaped HTML. Note that some mail components were fixed by @crynobone in #55149.

Here is a sample markdown template that demonstrates the 3 mail components included in this PR, subcopy, table, and footer

<x-mail::message subcopy="This is my subcopy">

<x-mail::table>
| Laravel       | Table         | Example       |
| ------------- | :-----------: | ------------: |
| Col 2 is      | Centered      | $10           |
| Col 3 is      | Right-Aligned | $20           |
</x-mail::table>

</x-mail::message>

The resulting rendered mailable.

Note: the closing } seen at the end of the sub-copy in the image has already been fixed by @crynobone in #55530 and is waiting for release next week

I am happy to makes changes or additions.

[jbraband]

I should add that with this PR, the mailable renders properly

[crynobone]

@jbraband I made some changes to how we solve this. Markdown::parse() should already return an instance of HtmlString and that shouldn't be encoded again.

Also add some integration tests to cover this usage

[crynobone]

Copy the logic from e() function

framework/src/Illuminate/Support/helpers.php

Lines 127 to 142 in 18a2f33

	function e($value, $doubleEncode = true)
	{
	if ($value instanceof DeferringDisplayableValue) {
	$value = $value->resolveDisplayableValue();
	}
	if ($value instanceof Htmlable) {
	return $value->toHtml();
	}
	if ($value instanceof BackedEnum) {
	$value = $value->value;
	}
	return htmlspecialchars($value ?? '', ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8', $doubleEncode);
	}

[jbraband]

@crynobone I'm not at a computer at the moment, but one of the other templates in the mail folder had the parse method with the unescaped blade {!! !!}

[jbraband]

@crynobone I'm not at a computer at the moment, but one of the other templates in the mail folder had the parse method with the unescaped blade {!! !!}

It's panel.blade.php @crynobone

[jbraband]

@crynobone I'm not at a computer at the moment, but one of the other templates in the mail folder had the parse method with the unescaped blade {!! !!}

It's panel.blade.php @crynobone

Was able to commit it from mobile

[jbraband]

I'll look to add a test for panel in the morning (CST)

[jbraband]

Thanks @crynobone!

🎉