Include renderer version into the platform tag in graphics context tests.

This allows to distinguish the results of the same renderer (e.g. GDI+-based
one) on the different OS versions (because GDI+ produces different results
under XP and Windows 8).

Closes #16260.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76554 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

tests/drawing/drawing.cpp

@@ -198,7 +198,17 @@ wxString GraphicsContextDrawingTestCase::GetTestsReferenceDirectory() const
 
 wxString GraphicsContextDrawingTestCase::GetPlatformTag() const
 {
-    return wxPlatformInfo::Get().GetOperatingSystemFamilyName().Lower();
+    // We consider that the platform tag is the kind of default renderer plus
+    // its major/minor versions.
+    // The reason why including major/minor version is important, is that the
+    // rendering engine typically evolves somewhat between two version
+    // (i.e. font rendering is not the same in Windows XP and Windows 8)
+    int major, minor;
+    const wxGraphicsRenderer *defaultRenderer = wxGraphicsRenderer::GetDefaultRenderer();
+    wxString rendererName = defaultRenderer->GetName();
+    defaultRenderer->GetVersion (&major, &minor);
+
+    return wxString::Format("%s-%d.%d", rendererName, major, minor);
 }
 
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