Subtle backtracking bug (collision detection)

[Tom Bell]

When the snake is only 2 cell's in length i.e. a head and 1 body part it's impossible to end the game by running into your tail but for snakes of any greater length this is possible.

Subtle collison detection bug?

[Josh Brown (joshbrown)]

I hadn't noticed this before - but it could be quite noticeable for some users and will need to be removed before 1.0.

[Josh Brown (joshbrown)]

Thinking about it, this kind of behavior makes sense: The snake should be able to chase it's tale (if it so chooses) without a gap between it's head an tail (since as the head moves forward, so does the tail), and if a snake goes backwards with only one body part it is (logically) chasing it's tail in a very tight loop. So I suppose, logically, this kind of behavior should be allowed.

However the graphical bug #631089 makes chasing your tail look very weird, so unless you have any objections I'll mark this as `Invalid` and we can focus our efforts on the graphical bug.

[Tom Bell (bushbaby2511)]

Good point. No objections to invalidating. On a similar note (possibly related to bug #631089) the head 'skips' a little after performing the above manouvre. looks like just the one cell but it could be related.

But as I said, as far as invalidating the bug i have no objections. The logic is sound.