When creating wxGCDC from an existing wxGraphicsContext, it is better to
keep using the attributes (such as font, pen, brush) already configured
for it rather than overwriting them with the default values, which is
not very useful, unlike the new behaviour, which allows to configure
wxGraphicsContext using features not supported by wxDC API (e.g. alpha
channel for pens/brushes) and then use it via wxDC API only (allowing
the existing legacy code to use alpha, for example).
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