Use the level stack to save return target for portal vaults/Abyss/Pan/Zigs/Lab.

Unlike the initial implementation that was talked about, this one nearly
completely ignores what stair is used to do X, meaning you can exit a branch
by any stair that goes up, etc.

Also, this commit earns the prize of the most rebased and edited one.  And it
ended up a tiny fraction of its initial size, with far simpler code to boot.

1 files changed, 0 insertions, 26 deletions

diff --git a/crawl-ref/source/place.cc b/crawl-ref/source/place.cc
index 0e69815f41..9266d724be 100644
--- a/crawl-ref/source/place.cc
+++ b/crawl-ref/source/place.cc
@@ -107,32 +107,6 @@ int absdungeon_depth(branch_type branch, int subdepth)
     return subdepth;
 }
 
-// Returns true if exits from this type of level involve going upstairs.
-bool branch_exits_up(branch_type branch)
-{
-    switch (branch)
-    {
-    case BRANCH_ZIGGURAT:
-    case BRANCH_LABYRINTH:
-    case BRANCH_BAZAAR:
-    case BRANCH_TROVE:
-    case BRANCH_SEWER:
-    case BRANCH_OSSUARY:
-    case BRANCH_BAILEY:
-    case BRANCH_ICE_CAVE:
-    case BRANCH_VOLCANO:
-    case BRANCH_WIZLAB:
-        return true;
-    default:
-        return false;
-    }
-}
-
-bool branch_exits_down(branch_type branch)
-{
-    return (branch == BRANCH_PANDEMONIUM || branch == BRANCH_ABYSS);
-}
-
 bool branch_allows_followers(branch_type branch)
 {
     return (is_connected_branch(branch) || branch == BRANCH_PANDEMONIUM);