Icecap effect does not affect enemies and hero if they are on a tile with vegetation.

[j123123]

No description provided.

[00-Evan]

looks like this has been the case since vanilla. The plant uses a pathfind check (which is common for larger radius effects, but not for a simple 3x3), and ignores cells that are vision blocking, instead of cells that are solid.

This is unintuitive behavior, and inconsistent with most other effects that only care about terrain being solid, so I'll treat it as a bug.

[j123123]

Hmmm... If the test will be "being solid" and if tile with web is considered solid, icecap effect will not work on enemies on the web tile. BTW, effect of potion of frost can't get through tile with web. Looks like another bug

[00-Evan]

That is intended, webs are considered solid terrain, like a closed door.