Fixed colors in tags pagination

Each page had recalculated tag opacity on its own. Now it's calculated against
global maximum.

src/Controllers/TagController.php

@@ -34,6 +34,7 @@ class TagController
 		}
 		else
 		{
+			$this->context->highestUsage = TagSearchService::getMostUsedTag()['post_count'];
 			$this->context->transport->paginator = new StdClass;
 			$this->context->transport->paginator->page = $page;
 			$this->context->transport->paginator->pageCount = $pageCount;

src/Models/SearchServices/TagSearchService.php

@@ -5,4 +5,16 @@ class TagSearchService extends AbstractSearchService
 	{
 		$stmt->addColumn(new SqlAliasFunctor(new SqlCountFunctor('post_tag.post_id'), 'post_count'));
 	}
+
+	public static function getMostUsedTag()
+	{
+		$stmt = new SqlSelectStatement();
+		$stmt->setTable('post_tag');
+		$stmt->addColumn('tag_id');
+		$stmt->addColumn(new SqlAliasFunctor(new SqlCountFunctor('post_tag.post_id'), 'post_count'));
+		$stmt->setGroupBy('post_tag.tag_id');
+		$stmt->setOrderBy('post_count', SqlSelectStatement::ORDER_DESC);
+		$stmt->setLimit(1, 0);
+		return Database::fetchOne($stmt);
+	}
 }

src/Views/tag-list.phtml

@@ -25,7 +25,7 @@
 <?php if (empty($this->context->transport->tags)): ?>
 	<p class="alert alert-warning">No tags to show.</p>
 <?php else: ?>
-	<?php $max = max([0]+array_map(function($x) { return $x['post_count']; }, $this->context->transport->tags)); ?>
+	<?php $max = $this->context->highestUsage ?>
 	<?php $add = 0. ?>
 	<?php $mul = 10. / max(1, log(max(1, $max))) ?>
 	<?php $url = \Chibi\UrlHelper::route('post', 'list', ['query' => '_query_']) ?>