Fix printing with glyph substitution

If a font has substituted any of the glyphs in the string, then we
cannot convert it to a string, as the glyph positions will no longer
match the positions of the characters. E.g. in the case of the
MS Calibri font, two subsequent t's are represented by a single glyph.
Printing text in Calibri with subsequent t's will thus cause the
first t to be position and sized based on the glyph representing "tt"
and glyphs after this to be position based on the wrong advance and the
text will look mangled, with some glyphs overlapping.

Task-number: QTBUG-4445
Reviewed-by: Gunnar

1 files changed, 5 insertions, 0 deletions

diff --git a/src/gui/painting/qprintengine_win.cpp b/src/gui/painting/qprintengine_win.cpp
index e59155c..a3f94d9 100644
--- a/src/gui/painting/qprintengine_win.cpp
+++ b/src/gui/painting/qprintengine_win.cpp
@@ -374,6 +374,11 @@ void QWin32PrintEngine::drawTextItem(const QPointF &p, const QTextItem &textItem
             convertToText = false;
             break;
         }
+
+        if (ti.logClusters[i] != i) {
+            convertToText = false;
+            break;
+        }
     }
 
     COLORREF cf = RGB(qRed(brushColor), qGreen(brushColor), qBlue(brushColor));