SVN commit 523337 by arwalker:

CCBUG:124367 Allow legends to be copied with a plot.

 M  +19 -0     kstviewarrow.cpp  
 M  +2 -0      kstviewarrow.h  
 M  +21 -0     kstviewbox.cpp  
 M  +2 -0      kstviewbox.h  
 M  +15 -0     kstviewellipse.cpp  
 M  +2 -0      kstviewellipse.h  
 M  +31 -2     kstviewlabel.cpp  
 M  +2 -0      kstviewlabel.h  
 M  +31 -0     kstviewlegend.cpp  
 M  +2 -0      kstviewlegend.h  
 M  +19 -1     kstviewline.cpp  
 M  +2 -0      kstviewline.h  
 M  +1 -0      kstviewobject.cpp  
 M  +18 -0     kstviewpicture.cpp  
 M  +2 -0      kstviewpicture.h  

Nicolas, would you mind testing for this problem again - you should at least see the legend now. It would help if you could come up with a set of repeatable steps (though I realise that may not be possible).

SVN commit 523354 by arwalker:

CCBUG:124367 Add back line

 M  +1 -0      kstviewline.cpp  


--- trunk/extragear/graphics/kst/src/libkstapp/kstviewline.cpp #523353:523354
@@ -74,6 +74,7 @@
   }
 
   // always these values
+  setTransparent(true);
   _type = "Line";
   setMinimumSize(QSize(1, 1));
 }

There is some progress here:
- I confirm that the legend is copied correctly
- I have found repeatable steps that lead to some plots disappearing and that trigger the assertion crash:

1) kst -w gyrodata.dat, load 3 curves in one window
2) Window->New (with default name)
3) F6 + P1->RMB: copy to W2
4) save to debug.kst, exit kst and reload debug.kst: it looks good
5) F6 + P2->RMB: copy to W2
6) save debug.kst, exit and reload debug.kst: the first plot in W1 is missing, as well as the second one in W2
7) in W1, do cleanup layout, default title: CRASH with above assertion failure! (note: after some more testing, the crash is not 100%... I hope you will catch it anyway) 

I hope you will be able to trace and fix the problems with this scenario...

SVN commit 523647 by arwalker:

BUG:124367 Ensure a unique plot name. Nicolas, I believe this should fix the problem you described. Thanks for describing the scenario so cleanly.

 M  +30 -5     kst2dplot.cpp  


--- trunk/extragear/graphics/kst/src/libkstapp/kst2dplot.cpp #523646:523647
@@ -435,11 +435,36 @@
   _type = "Plot";
 
   if (name.isEmpty()) {
-    plotName = KST::suggestPlotName();
+    plotName = i18n("Copy-%1").arg(plot.tagName());
   } else {
     plotName = name;
   }
 
+  KstApp *app = KstApp::inst();
+  KMdiIterator<KMdiChildView*> *iter;
+  bool duplicate = true;
+  static int last = 0;
+  
+  // check for unique plot name
+  while (duplicate) {
+    duplicate = false;
+    iter = app->createIterator();
+    while (iter->currentItem() && !duplicate) {
+      KMdiChildView *childview = iter->currentItem();
+      KstViewWindow *viewwindow = dynamic_cast<KstViewWindow*>(childview);
+      if (viewwindow) {
+        if (viewwindow->view()->findChild(plotName)) {
+          ++last;
+          plotName = i18n("Copy%1-%2").arg(last).arg(plot.tagName());
+          duplicate = true;
+          break;
+        }
+      }
+      iter->next();
+    }
+    app->deleteIterator(iter);
+  }
+  
   commonConstructor(plotName,
                     plot._xScaleMode,
                     plot._yScaleMode,
@@ -3256,14 +3281,14 @@
 
 
 void Kst2DPlot::copyObjectQuietly(KstViewObject& parent, const QString& name) const {
-  QString plotName;
-
+  QString plotName; 
+  
   if (name.isEmpty()) {
-    plotName = KST::suggestPlotName();
+    plotName = i18n("Copy-%1").arg(tagName());
   } else {
     plotName = name;
   }
-
+  
   parent.appendChild(new Kst2DPlot(*this, plotName), true);
 }
 

This seems to have solved the problems indeed. Thanks for the fix !