Fix regression in emitting of QTextDocument::undoCommandAdded()

The test I wrote was not testing if calling undo/redo had any effect
on emitting undoCommandAdded(), added these test cases and fixed the
QTextDocumentPrivate::endEditBlock so we now again emit only when an
undo command is added, not also on calling undo or redo.

Reviewed-by: mae
Reviewed-by: Samuel Rødal
(cherry picked from commit 7e1f19c3e3036f166a84dbaa916ec1da1cc818c6)

2 files changed, 14 insertions, 1 deletions

diff --git a/src/gui/text/qtextdocument_p.cpp b/src/gui/text/qtextdocument_p.cpp
index 2ad6512..18e1ffc 100644
--- a/src/gui/text/qtextdocument_p.cpp
+++ b/src/gui/text/qtextdocument_p.cpp
@@ -1114,9 +1114,11 @@ void QTextDocumentPrivate::endEditBlock()
         return;
 
     if (undoEnabled && undoState > 0) {
+        const bool wasBlocking = !undoStack[undoState - 1].block_end;
         if (undoStack[undoState - 1].block_part) {
             undoStack[undoState - 1].block_end = true;
-            emit document()->undoCommandAdded();
+            if (wasBlocking)
+                emit document()->undoCommandAdded();
         }
     }
 
diff --git a/tests/auto/qtextdocument/tst_qtextdocument.cpp b/tests/auto/qtextdocument/tst_qtextdocument.cpp
index 1d54409..11e32b0 100644
--- a/tests/auto/qtextdocument/tst_qtextdocument.cpp
+++ b/tests/auto/qtextdocument/tst_qtextdocument.cpp
@@ -2615,6 +2615,17 @@ void tst_QTextDocument::testUndoCommandAdded()
     cf.setFontItalic(true);
     cursor.mergeCharFormat(cf);
     QCOMPARE(spy.count(), 1);
+
+    spy.clear();
+    doc->undo();
+    QCOMPARE(spy.count(), 0);
+    doc->undo();
+    QCOMPARE(spy.count(), 0);
+    spy.clear();
+    doc->redo();
+    QCOMPARE(spy.count(), 0);
+    doc->redo();
+    QCOMPARE(spy.count(), 0);
 }
 
 void tst_QTextDocument::testUndoBlocks()