Don't put 0 in .assignable for y-mode choice syms

Just return (2,). More intuitive, and makes y-mode choices just work in
the menuconfig example.

Turns out to be simple to implement with choice symbol visibility
depending on the Choice.

1 files changed, 3 insertions, 0 deletions

diff --git a/kconfiglib.py b/kconfiglib.py
index 1d0c2d0..d8f070b 100644
--- a/kconfiglib.py
+++ b/kconfiglib.py
@@ -2720,6 +2720,9 @@ class Symbol(object):
         rev_dep_val = expr_value(self.rev_dep)
 
         if vis == 2:
+            if self.choice:
+                return (2,)
+
             if not rev_dep_val:
                 if self.type == BOOL or expr_value(self.weak_rev_dep) == 2:
                     return (0, 2)