Update anon talk messages to show on non-main namespaces

- Loads messageBox styles on non-main namespaces
- Add messageBox styles to 'skins.minerva.scripts' module for MobileFrontend's edit overlay page
- Prevent warning box from showing with empty message

Bug: T284642
Change-Id: I70d0d86671384210cc3ab43cb1d350ff2a862fd9

includes/MinervaHooks.php

@@ -366,18 +366,20 @@ class MinervaHooks {
 	 * - special pages
 	 * - edit workflow (action=edit and action=submit)
 	 * - when viewing old revisions
+	 * - non-main namespaces for anon talk page messages
 	 *
 	 * @param OutputPage $out
 	 */
 	private static function addMessageBoxStylesToPage( OutputPage $out ) {
 		$request = $out->getRequest();
+		$title = $out->getTitle();
 		// Warning box styles are needed when reviewing old revisions
 		// and inside the fallback editor styles to action=edit page.
 		$requestAction = $request->getVal( 'action' );
 		$viewAction = $requestAction === null || $requestAction === 'view';
 
 		if (
-			$out->getTitle()->isSpecialPage() ||
+			$title->getNamespace() !== NS_MAIN ||
 			$request->getText( 'oldid' ) ||
 			!$viewAction
 		) {

includes/Skins/skin.mustache

@@ -50,10 +50,12 @@
 			<div class="banner-container">
 			{{>banners}}
 			</div>
+			{{#html-user-message}}
 			<div class="minerva-anon-talk-message warningbox">
 				<span class="mw-ui-icon mw-ui-icon-wikimedia-userTalk-warning"> </span>
 				{{{html-user-message}}}
 			</div>
+			{{/html-user-message}}
 			<div class="pre-content heading-holder">
 				<div class="page-heading">
 					{{{headinghtml}}}

resources/skins.minerva.base.styles/anonTalkMessage.less

@@ -1,5 +1,4 @@
 .minerva-anon-talk-message.warningbox {
-	display: none;
 	margin-top: 16px;
 	margin-bottom: 0;
 
@@ -13,6 +12,7 @@
 	}
 }
 
-.ns-special .minerva-anon-talk-message {
-	display: block;
+// Hide on all non-main namespaces
+.ns-0 .minerva-anon-talk-message {
+	display: none;
 }

skin.json

@@ -517,6 +517,7 @@
 				"skins.minerva.icons.page.issues.uncolored",
 				"skins.minerva.icons.page.issues.default.color",
 				"skins.minerva.icons.page.issues.medium.color",
+				"skins.minerva.messageBox.styles",
 				"mediawiki.util",
 				"mediawiki.router",
 				"mediawiki.Title",