Add drawing a multi-line text to the printing sample

This can be helpful in testing API to draw multi-line texts.

See #17798.

samples/printing/printing.cpp

@@ -162,6 +162,8 @@ void MyApp::Draw(wxDC&dc)
 
     dc.DrawText( wxT("Test message: this is in 10 point text"), 10, 180);
 
+    dc.DrawRotatedText( wxS("This\nis\na multi-line\ntext"), 170, 100, -m_angle/1.5);
+
 #if wxUSE_UNICODE
     const char *test = "Hebrew    שלום -- Japanese (日本語)";
     wxString tmp = wxConvUTF8.cMB2WC( test );
@@ -249,6 +251,7 @@ void MyApp::Draw(wxDC&dc)
         delete gc;
     }
 #endif
+
 }