Qt Designer's property editor: the newline character doesn't work with dynamic properties

According to Property Editor documentation:

Qt Designer interprets the backslash () character specially, enabling newline (\n) characters to be inserted into the text; the \ \ character sequence is used to insert a single backslash into the text. A context menu can also be opened while editing, providing another way to insert special characters and newlines into the text.

But when adding dynamic properties with Qt Designer's property editor, the result in unexpected.

Steps to reproduce:

1. Create a new dialog.ui with Qt Desginer
1. Press the "+" button in Qt Designer's property editor
2. Select "String.."
3. Fill the "Property Name" field and select String as the Property Type
4. Then write e.g. "line1\nline2" into the property's field
5. create the h file with uic on command prompt: "uic dialog -o dialog.h"
6. Open the dialog.h -file and check the result:

Dialog->setProperty("test", QVariant(QApplication::translate("Dialog", "line1\\nline2", 0, QApplication::UnicodeUTF8)));

So it doesn't recognize the newline character but adds an extra backslash in front of it.