qt-bugs@ issue : 
bugs.kde.org number :
applied: yes
author: Waldo Bastian <bastian@kde.org>

QTextEdit::zoomIn /QTextEdit::zoomOut does not work if the original
font had its size specified in pixels instead of points.
pointSize() returns 0 in such case.

Index: src/widgets/qtextedit.cpp
===================================================================
--- src/widgets/qtextedit.cpp.orig
+++ src/widgets/qtextedit.cpp
@@ -5774,7 +5774,11 @@ void TQTextEdit::setFont( const TQFont &
 void TQTextEdit::zoomIn( int range )
 {
     TQFont f( TQScrollView::font() );
-    f.setPointSize( TQFontInfo(f).pointSize() + range );
+    TQFontInfo fi(f);
+    if (fi.pointSize() <= 0)
+       f.setPixelSize( fi.pixelSize() + range );
+    else
+       f.setPointSize( fi.pointSize() + range );
     setFont( f );
 }
 
@@ -5789,7 +5793,11 @@ void TQTextEdit::zoomIn( int range )
 void TQTextEdit::zoomOut( int range )
 {
     TQFont f( TQScrollView::font() );
-    f.setPointSize( TQMAX( 1, TQFontInfo(f).pointSize() - range ) );
+    TQFontInfo fi(f);
+    if (fi.pointSize() <= 0)
+       f.setPixelSize( TQMAX( 1, fi.pixelSize() - range ) );
+    else
+       f.setPointSize( TQMAX( 1, fi.pointSize() - range ) );
     setFont( f );
 }