Reduce strange interactions between Shoals tides and temp water

When a tidal change happened, sometimes large chunks of temp water
would be outright removed (even when they were far from the shoreline),
and without actually removing the terrain change marker (which caused
bits of land that were curiously immune to being flooded again).

I have to admit that I don't entirely understand all the tidal code
so it's possible this fix doesn't do exactly what I think it does, but it
does seem to address the visible issue - temp water is preserved
regardless of tidal movement, which continues to operate normally around
it.

1 files changed, 1 insertions, 0 deletions

diff --git a/crawl-ref/source/terrain.h b/crawl-ref/source/terrain.h
index d879f0a6f3..6dfca2541e 100644
--- a/crawl-ref/source/terrain.h
+++ b/crawl-ref/source/terrain.h
@@ -129,6 +129,7 @@ void temp_change_terrain(coord_def pos, dungeon_feature_type newfeat, int dur,
                          terrain_change_type type = TERRAIN_CHANGE_GENERIC,
                          const monster* mon = NULL);
 bool revert_terrain_change(coord_def pos, terrain_change_type ctype);
+bool is_temp_terrain(coord_def pos);
 
 bool plant_forbidden_at(const coord_def &p, bool connectivity_only = false);