http://bugzilla.lyx.org/show_bug.cgi?id=2202

Jean-Marc,

I found that the attached patch fixes the described crash for me. The cases 
described in bug 2155 still work. However, I'm not really sure I got the 
logic. Does this make sense to you?

Jürgen
Index: src/text2.C
===================================================================
RCS file: /usr/local/lyx/cvsroot/lyx-devel/src/text2.C,v
retrieving revision 1.638
diff -p -u -r1.638 text2.C
--- src/text2.C	23 Jan 2006 10:25:41 -0000	1.638
+++ src/text2.C	30 Jan 2006 14:50:41 -0000
@@ -1248,8 +1248,9 @@ bool LyXText::deleteEmptyParagraphMechan
 
 	if (oldpar.empty() || (oldpar.size() == 1 && oldpar.isLineSeparator(0))) {
 		// Delete old par.
-		recordUndo(old, Undo::ATOMIC, 
-			   old.pit(), min(old.pit() + 1, old.lastpit()));
+		recordUndo(old, Undo::ATOMIC,
+			   std::max(old.pit() - 1, 0),
+			   min(old.pit() + 1, old.lastpit()));
 		ParagraphList & plist = old.text()->paragraphs();
 		plist.erase(plist.begin() + old.pit());
 

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