This patch was send to the mailing list by Ryan (aka sik0fewl).

This patch was send to the mailing list by Ryan (aka sik0fewl).
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I've made it so that sliding on ice works again (after the changes to the
input handling functions--looks much nicer now, btw).

I also changed supertux.stgt to make snow5.png ice. You can try out sliding
around on ice in the second level. I wasn't really sure what would be a good
sliding rate so people should try fiddling with different values.

Right now the accel/decel rate is the direct inverse of the velocity.. this
inverse can be increased or decreased.

Also, the smalltux animation doesn't "slide", he walks to a stop.. haven't
really looked into where to fix this, but I'm sure others could find it and
fix it before I could.
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SVN-Revision: 532