X-Git-Url: https://git.lyx.org/gitweb/?a=blobdiff_plain;f=src%2Fmathed%2FMathAutoCorrect.cpp;h=5d5a7d098c4782057603ac8e373f64529052cbae;hb=c609e9cbcf;hp=be5aeb42d0430c127179379784f8275431b83437;hpb=144e7d715938af7cadd9073f4afc30f3744a226a;p=lyx.git

diff --git a/src/mathed/MathAutoCorrect.cpp b/src/mathed/MathAutoCorrect.cpp
index be5aeb42d0..5d5a7d098c 100644
--- a/src/mathed/MathAutoCorrect.cpp
+++ b/src/mathed/MathAutoCorrect.cpp
@@ -10,8 +10,9 @@
 
 #include <config.h>
 
-#include "Cursor.h"
 #include "MathAutoCorrect.h"
+
+#include "Cursor.h"
 #include "MathData.h"
 #include "InsetMath.h"
 #include "MathSupport.h"
@@ -90,8 +91,17 @@ bool Correction::correct(Cursor & cur, char_type c) const
 	LYXERR(Debug::MATHED, "match found! subst in " << cur.cell()
 		<< " from: '" << from1_ << "' to '" << to_ << '\'');
 
-	cur.cell().erase(cur.pos() - n, cur.pos());
-	cur.pos() -= n;
+	/* To allow undoing the completion, we proceed in 4 steps
+	 * - inset the raw character
+	 * - split undo group so that we have two separate undo actions
+	 * - record undo, delete the character we just entered and the from1_ part
+	 * - finally, do the insertion of the correction.
+	 */
+	cur.insert(c);
+	cur.splitUndoGroup();
+	cur.recordUndoSelection();
+	cur.cell().erase(cur.pos() - n - 1, cur.pos());
+	cur.pos() -= n + 1;
 
 	cur.insert(to_);
 	return true;