Could you make a visual example?
Examples 1 and 2 show current Swimmer behaviour, Example 3 is what we're suggesting could happen when a Swimmer's trigger area is forced to descend completely below the water by at least 1px:
At present, the Swimmer's trigger area cannot be forced to descend below the water in this way; as soon as the trigger hits the bottom of the water, the lem simply turns around and carries on Swimming in the opposite direction.
My suggestion is that any slope which descends to the very bottom of the water trigger can be used to force the Swimmer to also descend below the water and transition to Faller. If the slope does not descend below the water (as per Example 2), then the Swimmer continues in the same direction.
I think the confusion has perhaps come from what Strato said about the Swimmer
turning around and going back the other way if the slope does not descend to the bottom of the water; this is not actually what I'm suggesting. Any slope which doesn't descend to the very bottom pixel of the water's trigger area should be traversable by a Swimmer (again, as per Example 2). They would only turn around if the bottom of the slope becomes a vertical wall whilst still within the water's trigger, like this:
EDIT: To be extra clear, the base of the slope would have to be
touching the very bottom pixel of the water trigger (or below) in order for the Swimmer's trigger to drop below the water. In other words,
Swimmers will always try to go past the end of a slope if they can. Only 2 things would stop them from doing so: a) the slope touching the bottom edge of the water trigger, which causes the lem to exit the water and transition to Faller, or b) the slope ending with a vertical wall
whilst still within the water trigger, which causes the lem to turn around as usual
EDIT 2: To be extra
extra clear, in these examples, "vertical wall" simply means any vertical terrain currently not traversable by a Swimmer; I'm not sure what the exact terrain height has to be in order for the a Swimmer to not continue past it, but this of course should remain the same.
The only change being suggested is that Swimmer triggers be allowed to drop below water if forced to do so by sloping terrain.