Can't reproduce.

Created attachment 15995 [details]
Proposed patch

The problem was that updateSelf() in Kst2dPlot was being called from
revertForPrint(). This was causing a negatively sized plot region. Once this
propagated through to KstViewLegend the resulting null bitmap resulted in a
crash.

The revertForPrint() is no longer necessary as the various bugs in the clip
region and buffering have since been addressed.

SVN commit 539423 by arwalker:

BUG:126992 A narrower fix than the proposed patch, as we may wish to later change the printing resize functions

 M  +10 -8     kstviewlegend.cpp  
 M  +0 -3      kstviewobject.cpp  


--- trunk/extragear/graphics/kst/src/libkstapp/kstviewlegend.cpp #539422:539423
@@ -207,14 +207,16 @@
   setDirty(false);
 
   _backBuffer.buffer().resize(contentsRect().size());
-  _backBuffer.buffer().fill(backgroundColor());
-  KstPainter p;
-  p.begin(&_backBuffer.buffer());
-  QPen pen;
-  pen.setColor(foregroundColor());
-  p.setPen(pen);
-  drawToPainter(p);
-  p.end();
+  if (!_backBuffer.buffer().isNull()) {
+    _backBuffer.buffer().fill(backgroundColor());
+    KstPainter p;
+    p.begin(&_backBuffer.buffer());
+    QPen pen;
+    pen.setColor(foregroundColor());
+    p.setPen(pen);
+    drawToPainter(p);
+    p.end();
+  }
 }
 
 
--- trunk/extragear/graphics/kst/src/libkstapp/kstviewobject.cpp #539422:539423
@@ -625,7 +625,6 @@
 void KstViewObject::parentResizedForPrint() {
   _geomOld = _geom;
   updateFromAspect();
-  //updateSelf();
   for (KstViewObjectList::Iterator i = _children.begin(); i != _children.end(); ++i) {
     (*i)->parentResizedForPrint();
   }
@@ -634,8 +633,6 @@
 
 void KstViewObject::parentRevertedForPrint() {
   _geom = _geomOld;
-  invalidateClipRegion();
-  updateSelf();
   for (KstViewObjectList::Iterator i = _children.begin(); i != _children.end(); ++i) {
     (*i)->parentRevertedForPrint();
   }