Fix #9663: Changelog underlines incorrect lengths

The text underlines on the changelog page are displayed with an incorrect
length when the version name contains characters that are encodable via
htmlspecialchars(). We need to use the length of the raw string instead
of the length of the encoded string.

changelog_page.php

@@ -78,7 +78,6 @@ function print_version_header( $p_version_id ) {
 	$t_version_name = version_get_field( $p_version_id, 'version' );
 	$t_project_name = project_get_field( $t_project_id, 'name' );
 
-	$t_release_title_without_hyperlinks = string_display_line( $t_project_name ) . ' - ' . string_display_line( $t_version_name );
 	$t_release_title = '<a href="changelog_page.php?project_id=' . $t_project_id . '">' . string_display_line( $t_project_name ) . '</a> - <a href="changelog_page.php?version_id=' . $p_version_id . '">' . string_display_line( $t_version_name ) . '</a>';
 
 	if ( config_get( 'show_changelog_dates' ) ) {
@@ -96,7 +95,7 @@ function print_version_header( $p_version_id ) {
 
 	echo '<br />', $t_release_title, $t_release_date, lang_get( 'word_separator' ), print_bracket_link( 'view_all_set.php?type=1&temporary=y&' . FILTER_PROPERTY_PROJECT_ID . '=' . $t_project_id . '&' . filter_encode_field_and_value( FILTER_PROPERTY_FIXED_IN_VERSION, $t_version_name ), lang_get( 'view_bugs_link' ) ), '<br />';
 
-	$t_release_title_without_hyperlinks .= $t_release_date;
+	$t_release_title_without_hyperlinks = $t_project_name . ' - ' . $t_version_name . $t_release_date;
 	echo utf8_str_pad( '', utf8_strlen( $t_release_title_without_hyperlinks ), '=' ), '<br />';
 }