Fix bug #2213 (part 1): GuiChanges lacks "Previous Change" button.

Add LFUN_CHANGE_PREVIOUS.

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@29109 a592a061-630c-0410-9148-cb99ea01b6c8

src/BufferView.cpp

@@ -983,6 +983,7 @@ FuncStatus BufferView::getStatus(FuncRequest const & cmd)
 
 	case LFUN_CHANGES_MERGE:
 	case LFUN_CHANGE_NEXT:
+	case LFUN_CHANGE_PREVIOUS:
 	case LFUN_ALL_CHANGES_ACCEPT:
 	case LFUN_ALL_CHANGES_REJECT:
 		// TODO: context-sensitive enabling of LFUNs
@@ -1228,6 +1229,12 @@ bool BufferView::dispatch(FuncRequest const & cmd)
 		processUpdateFlags(Update::Force | Update::FitCursor);
 		break;
 	
+	case LFUN_CHANGE_PREVIOUS:
+		findPreviousChange(this);
+		// FIXME: Move this LFUN to Buffer so that we don't have to do this:
+		processUpdateFlags(Update::Force | Update::FitCursor);
+		break;
+
 	case LFUN_CHANGES_MERGE:
 		if (findNextChange(this)) {
 			processUpdateFlags(Update::Force | Update::FitCursor);

src/FuncCode.h

@@ -348,10 +348,10 @@ enum FuncCode
 	LFUN_PARAGRAPH_MOVE_UP,
 	LFUN_BUFFER_TOGGLE_COMPRESSION, // bpeng 20060427
 	// 265
-	LFUN_MATH_BIGDELIM,
 	LFUN_CLIPBOARD_PASTE,
 	LFUN_INSET_DISSOLVE,            // jspitzm 20060807
 	LFUN_CHANGE_NEXT,
+	LFUN_CHANGE_PREVIOUS,           // vfr 20090404
 	LFUN_WINDOW_NEW,                // Abdel 20061021
 	// 270
 	LFUN_WINDOW_CLOSE,              // Abdel 20061023
@@ -425,6 +425,8 @@ enum FuncCode
 	LFUN_SCREEN_SHOW_CURSOR,        // vfr, 20090325
 	LFUN_BUFFER_ZOOM_IN,            // vfr, 20090330
 	LFUN_BUFFER_ZOOM_OUT,           // vfr, 20090330
+	// 330
+	LFUN_MATH_BIGDELIM,
 
 
 	LFUN_LASTACTION                 // end of the table

src/LyXAction.cpp

@@ -2108,6 +2108,15 @@ void LyXAction::init()
  * \endvar
  */
 		{ LFUN_CHANGE_NEXT, "change-next", ReadOnly, Edit },
+/*!
+ * \var lyx::FuncCode lyx::LFUN_CHANGE_PREVIOUS
+ * \li Action: Moves the cursor to the position of the previous change
+               of the change tracking records.
+ * \li Syntax: change-previous
+ * \li Origin: vfr, 4 Apr 2009
+ * \endvar
+ */
+		{ LFUN_CHANGE_PREVIOUS, "change-previous", ReadOnly, Edit },
 /*!
  * \var lyx::FuncCode lyx::LFUN_CHANGES_MERGE
  * \li Action: Open change tracking dialog for merging and moves the cursor