From 9a9e94bca24173e93b257cc179c37d53754e9922 Mon Sep 17 00:00:00 2001
From: Stefan Schimanski <sts@lyx.org>
Date: Sun, 9 Mar 2008 23:43:05 +0000
Subject: [PATCH] * fix for http://bugzilla.lyx.org/show_bug.cgi?id=2556   "not
 possible to delete a label of a formula":

  Press forward delete at the end of a row and the label is deleted.


git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@23610 a592a061-630c-0410-9148-cb99ea01b6c8
---
 src/mathed/InsetMathHull.cpp | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/src/mathed/InsetMathHull.cpp b/src/mathed/InsetMathHull.cpp
index 63065c2fb9..47615db07d 100644
--- a/src/mathed/InsetMathHull.cpp
+++ b/src/mathed/InsetMathHull.cpp
@@ -26,6 +26,7 @@
 #include "InsetMathRef.h"
 
 #include "Buffer.h"
+#include "buffer_funcs.h"
 #include "BufferParams.h"
 #include "BufferView.h"
 #include "CutAndPaste.h"
@@ -492,7 +493,12 @@ void InsetMathHull::label(row_type row, docstring const & label)
 {
 	//lyxerr << "setting label '" << label << "' for row " << row << endl;
 	if (label_[row]) {
-		label_[row]->updateCommand(label);
+		if (label.empty()) {
+			delete label_[row];
+			nonum_[row] = true;
+			label_[row] = dummy_pointer;
+		} else
+			label_[row]->updateCommand(label);
 		return;
 	}
 	InsetCommandParams p(LABEL_CODE);
@@ -1175,6 +1181,19 @@ void InsetMathHull::doDispatch(Cursor & cur, FuncRequest & cmd)
 		break;
 	}
 
+	case LFUN_WORD_DELETE_FORWARD:
+	case LFUN_CHAR_DELETE_FORWARD:
+		if (col(cur.idx()) + 1 == ncols()
+		    && cur.pos() == cur.lastpos()
+		    && !label(row(cur.idx())).empty()) {
+			cur.recordUndoInset();
+			label(row(cur.idx()), docstring());
+		} else {
+			InsetMathGrid::doDispatch(cur, cmd);
+			return;
+		}
+		break;
+
 	case LFUN_INSET_INSERT: {
 		//lyxerr << "arg: " << to_utf8(cmd.argument()) << endl;
 		// FIXME: this should be cleaned up to use InsetLabel methods directly.