Fix [ab839efc5f]: text edit undo: clearing text instead of restoring.

generic/tkText.c

@@ -5087,6 +5087,10 @@ TextEditUndo(
 	return TCL_OK;
     }
 
+    if (textPtr->sharedTextPtr->autoSeparators) {
+	TkUndoInsertUndoSeparator(textPtr->sharedTextPtr->undoStack);
+    }
+
     /*
      * Turn off the undo feature while we revert a compound action, setting
      * the dirty handling mode to undo for the duration (unless it is
@@ -5105,6 +5109,10 @@ TextEditUndo(
     }
     textPtr->sharedTextPtr->undo = 1;
 
+    if (textPtr->sharedTextPtr->autoSeparators) {
+	TkUndoInsertUndoSeparator(textPtr->sharedTextPtr->undoStack);
+    }
+
     /*
      * Convert undo/redo temporary marks set by TkUndoRevert() into
      * indices left in the interp result.

tests/text.test

@@ -7039,7 +7039,21 @@ test text-27.28 {edit undo and edit redo do not leave \
 } -cleanup {
     destroy .t
 } -result {1 1}
-
+test text-27.29 {bug ab839efc5f - .text edit undo inserts separators} -setup {
+    destroy .t
+} -body {
+    text .t -undo 1
+    .t insert 1.0 "1. 123 5 789012  LINE-1\n2.\n3. 123 5 789012  LINE-3\n"
+    .t tag add sel 3.0 3.end
+    .t delete sel.first sel.last
+    .t edit undo
+    .t tag add sel 3.0 3.end
+    .t delete sel.first sel.last
+    .t edit undo
+    .t get 3.0 3.end
+} -cleanup {
+    destroy .t
+} -result {3. 123 5 789012  LINE-3}
 
 test text-28.1 {bug fix - 624372, ControlUtfProc long lines} -body {
     pack [text .t -wrap none]