feat(widgets): zibll-like in_affix sticky option across side modules

Add sidebar affix (data-affix) to ranking, user/author cards, main/hot/
paid/forum lists, comments, tag cloud, categories and text title with
shared sticky CSS.

src/AKSRT/Widgets/RecentCommentsWidget.php

@@ -169,7 +169,14 @@ class RecentCommentsWidget extends \WP_Widget {
 		if ($title !== '') {
 			echo $args['before_title'] . esc_html($title) . $args['after_title']; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
 		}
+		$in_affix = !empty($instance['in_affix']);
+		if ($in_affix) {
+			echo '<div class="is-affix" data-affix="true">';
+		}
 		echo self::render_html($instance); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
+		if ($in_affix) {
+			echo '</div>';
+		}
 		echo $args['after_widget']; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
 	}
 
@@ -202,6 +209,9 @@ class RecentCommentsWidget extends \WP_Widget {
 			</label>
 			<small><?php esc_html_e('填数字 ID 时按作者排除；填文字时按内容关键词排除（兼容旧配置）。', 'aksrt'); ?></small>
 		</p>
+		<p>
+			<label><input type="checkbox" name="<?php echo esc_attr($this->get_field_name('in_affix')); ?>" value="1" <?php checked(!empty($instance['in_affix'])); ?>> <?php esc_html_e('侧栏随动', 'aksrt'); ?></label>
+		</p>
 		<?php
 	}