Mark scales as partially suppressed in statue form.

This necessitates distinguishing partially-active from hunger-based
activity, so add MUTACT_HUNGER and use that for non-physical mutations
on vampires between satiated and very full.

Also add a function to properly format fake mutations that depend on
form.

Note that, for these purposes, "thin skeletal structure" and "distortion
field" do not count as scales (they are fully active in all forms).

1 files changed, 4 insertions, 3 deletions

diff --git a/crawl-ref/source/mutation.h b/crawl-ref/source/mutation.h
index 6322c65e09..1f50841dd9 100644
--- a/crawl-ref/source/mutation.h
+++ b/crawl-ref/source/mutation.h
@@ -13,9 +13,10 @@ class formatted_string;
 
 enum mutation_activity_type
 {
-    MUTACT_INACTIVE,
-    MUTACT_PARTIAL,
-    MUTACT_FULL,
+    MUTACT_INACTIVE, // form-based mutations in most forms
+    MUTACT_PARTIAL,  // scales on statues
+    MUTACT_HUNGER,   // non-physical mutations on vampires
+    MUTACT_FULL,     // other mutations
 };
 
 struct body_facet_def