Workaround for QTBUG-14949, eliding multi-line itemview items breaks

qrenderdoc/Styles/RDTweakedNativeStyle/RDTweakedNativeStyle.cpp

@@ -24,6 +24,7 @@
 
 #include "RDTweakedNativeStyle.h"
 #include <QDebug>
+#include <QFontMetrics>
 #include <QPainter>
 #include <QPen>
 #include <QStyleOption>
@@ -379,5 +380,40 @@ void RDTweakedNativeStyle::drawControl(ControlElement control, const QStyleOptio
     return;
   }
 
+// https://bugreports.qt.io/browse/QTBUG-14949
+// work around itemview rendering bug - the first line in a multi-line text that is elided stops
+// all subsequent text from rendering. Should be fixed in 5.11, but for all other versions we need
+// to manually step in. We manually elide the text before calling down to the style
+#if(QT_VERSION < QT_VERSION_CHECK(5, 11, 0))
+  if(control == QStyle::CE_ItemViewItem)
+  {
+    const QStyleOptionViewItem *viewopt = qstyleoption_cast<const QStyleOptionViewItem *>(opt);
+
+    // only if we're eliding, not wrapping, and we have multiple lines
+    if((viewopt->features & QStyleOptionViewItem::WrapText) == 0 &&
+       viewopt->text.contains(QChar::LineSeparator))
+    {
+      const int hmargin = pixelMetric(QStyle::PM_FocusFrameHMargin, 0, widget) + 1;
+
+      QRect textRect =
+          subElementRect(SE_ItemViewItemText, viewopt, widget).adjusted(hmargin, 0, -hmargin, 0);
+
+      QFontMetrics metrics(viewopt->font);
+
+      QStringList lines = viewopt->text.split(QChar::LineSeparator);
+
+      for(QString &line : lines)
+        line = metrics.elidedText(line, viewopt->textElideMode, textRect.width(), 0);
+
+      QStyleOptionViewItem elided = *viewopt;
+
+      elided.text = lines.join(QChar::LineSeparator);
+
+      QProxyStyle::drawControl(control, &elided, p, widget);
+      return;
+    }
+  }
+#endif
+
   QProxyStyle::drawControl(control, opt, p, widget);
 }