Create new font for checkmark

src/timeline/TimelineItem.cc

@@ -64,13 +64,14 @@ TimelineItem::init()
         mainLayout_->setContentsMargins(conf::timeline::headerLeftMargin, 0, 0, 0);
         mainLayout_->setSpacing(0);
 
+        QFont checkmarkFont;
+        checkmarkFont.setPixelSize(conf::timeline::fonts::timestamp);
+
         // Setting fixed width for checkmark because systems may have a differing width for a
         // space and the Unicode checkmark.
         checkmark_ = new QLabel(" ", this);
-        checkmark_->setFixedWidth(fm.width(CHECKMARK));
-        checkmark_->setFont(font_);
-        checkmark_->setStyleSheet(
-          QString("font-size: %1px;").arg(conf::timeline::fonts::timestamp));
+        checkmark_->setFont(checkmarkFont);
+        checkmark_->setFixedWidth(QFontMetrics{checkmarkFont}.width(CHECKMARK));
 }
 
 /*