ifdef QFontMetrics::horizontalAdvance to make it work with older Qt

src/playlist/playlistview.cpp

@@ -100,7 +100,11 @@ void PlaylistProxyStyle::drawControl(ControlElement element, const QStyleOption
     const QFontMetrics &font_metrics = header_option->fontMetrics;
 
     // Spaces added to make transition less abrupt
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 11, 0))
     if (rect.width() < font_metrics.horizontalAdvance(text + "  ")) {
+#else
+    if (rect.width() < font_metrics.width(text + "  ")) {
+#endif
       const Playlist::Column column = static_cast<Playlist::Column>(header_option->section);
       QStyleOptionHeader new_option(*header_option);
       new_option.text = Playlist::abbreviated_column_name(column);