Change what decides whether the email additional text container should be open

It was a `class=hidden` on the container itself, checking form component's value to see if it should be added or not. Now it's `class=expanded` on an element defined by `data-class-target`, a textarea in this case, where `class=expanded` is added in the form factory if needed.

CSS `:has()` is currently not supported by Firefox (it's behind a flag) but guess that's ok by me.

Fixes
```
 ------ ---------- ------------------------------------------------------------------------------------------------------------------------------------
  Line   Compiled   Admin/Presenters/templates/Emails/default.latte rendered from MichalSpacekCz\Admin\Presenters\EmailsPresenter::default
         line       See compiled template: /tmp/phpstan-latte/app/Admin/Presenters/templates/Emails/default.latte.ffc5a80775bd006bd5dcca69684ee311.php
 ------ ---------- ------------------------------------------------------------------------------------------------------------------------------------
  63     364        Cannot access offset 'additional' on Nette\Forms\Controls\BaseControl.
 ------ ---------- ------------------------------------------------------------------------------------------------------------------------------------
```

Author: spaze

site/app/Admin/Presenters/templates/Emails/default.latte

@@ -60,7 +60,7 @@
 			<td></td>
 			<td colspan="5">{input feedbackRequest}</td>
 		</tr>
-		<tr n:class="expand-container, !$form[applications][$application->id][additional]->value ? hidden">
+		<tr class="expand-container" data-class-target="textarea">
 			<td></td>
 			<td></td>
 			<td colspan="5">

site/app/Form/TrainingMailsOutboxFormFactory.php

@@ -39,6 +39,7 @@ public function create(callable $onSuccess, array $applications): Form
 		$form = $this->factory->create();
 
 		$applicationsContainer = $form->addContainer('applications');
+		$additionalInputs = [];
 
 		foreach ($applications as $application) {
 			$applicationIdsContainer = $applicationsContainer->addContainer($application->id);
@@ -101,7 +102,7 @@ public function create(callable $onSuccess, array $applications): Form
 			if ($sendCheckboxTitle) {
 				$send->setHtmlAttribute('title', implode("\n", $sendCheckboxTitle));
 			}
-			$applicationIdsContainer->addTextArea('additional')
+			$additionalInputs[] = $applicationIdsContainer->addTextArea('additional')
 				->setHtmlAttribute('placeholder', 'Dodatečný text')
 				->setHtmlAttribute('cols', 80)
 				->setHtmlAttribute('rows', 3);
@@ -181,6 +182,13 @@ public function create(callable $onSuccess, array $applications): Form
 			}
 			$onSuccess($sent);
 		};
+		$form->onAnchor[] = function () use ($additionalInputs): void {
+			foreach ($additionalInputs as $additionalInput) {
+				if ($additionalInput->getValue()) {
+					$additionalInput->setHtmlAttribute('class', 'expanded');
+				}
+			}
+		};
 		return $form;
 	}
 

site/public/www.michalspacek.cz/i/css/screen.css

@@ -376,6 +376,9 @@ div.notice {
 	margin-left: 1.1em;
 	line-height: 0;
 }
+#frm-mails .expand-container:not(:has(.expanded)) {
+	display: none;
+}
 #frm-passwordsStorages #frm-passwordsStorages-algo-from { width: 200px; }
 #pubkey {
 	background-color: #F7F7FF;

site/public/www.michalspacek.cz/i/js/admin.js

@@ -106,7 +106,10 @@ App.ready(document, function () {
 
 	App.onClick('#emails tbody .button', function () {
 		for (const item of this.parentElement.parentElement.querySelectorAll('.expand-container')) {
-			item.classList.toggle('hidden');
+			const classTarget = item.querySelector(item.dataset.classTarget);
+			if (classTarget) {
+				classTarget.classList.toggle('expanded');
+			}
 		}
 	});
 	App.onClick('#emails #checkAll', function (event) {