[sugar] Hippo Canvas

[Benjamin M. Schwartz]

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Gerard J. Cerchio wrote:
> Sorry to say that I am having a terrifically hard time trying to use the 
> hippo canvas.

hippocanvas is sort of deprecated.  Initially, hippocanvas was to be the basic
building block for all Activities, but it proved too immature to be used
everywhere.  Instead activity developers are encouraged to use the standard GTK
components.  However, hippocanvas does provide some features that are difficult
or impossible with standard GTK, as used by Chat and a few other Sugar elements.
 Therefore, it is included in the build.

You should only use hippocanvas if you know that what you are doing would be
more difficult without it.

For your case, I recommend plain Cairo instead.

- --Ben
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