Git: Fix log editor shows as modified

Fixes: QTCREATORBUG-25936
Change-Id: I072c723e59073399531b822ec76bdac08867c72b
Reviewed-by: André Hartmann <aha_1980@gmx.de>

src/plugins/git/giteditor.cpp

@@ -217,6 +217,7 @@ void GitEditorWidget::setPlainText(const QString &text)
         for (const auto &formattedChunk : formattedTextList)
             cursor.insertText(formattedChunk.text, formattedChunk.format);
         cursor.endEditBlock();
+        document()->setModified(false);
 
         return;
     }