small bugfix patch

[Malcolm Wallace]

Please find attached a small bugfix patch for Chart. It removes a
runtime pattern-match-failure error, in the PickFn code for
interactive hit-testing.

Regards,
Malcolm

(By the way, the patch also bumps the version number because we are
using Chart in production at work, and need a certain amount of
versioning policy to ensure reproducibility. If you'd rather I didn't
incorporate such patch-level version number bumps, I'll try to keep
them separate in future.)

[Tim Docker]

Hi,

Do we need to introduce the additional constructor L1P_Nothing? The pick
functions return
Maybe values in any case. Does the attached patch meet your needs instead?

Tim

[Malcolm Wallace]

> Do we need to introduce the additional constructor L1P_Nothing? The
> pick functions return Maybe values in any case. Does the attached
> patch meet your needs instead?

Sorry for the delay in response - sure, your version of this patch
looks better than mine. (But I could not apply it directly, because
it depends on at least one other unpublished patch of yours.)

Regards,
Malcolm

[Tim Docker]

> Sorry for the delay in response - sure, your version of this patch
> looks better than mine. (But I could not apply it directly, because
> it depends on at least one other unpublished patch of yours.)

I've pushed this.

Tim