transient--parse-suffix: Fix regression breaking :setup-children

In [1: fb88f803] we wrongly concluded that the only type of function
left to be handled by this branch are `lambda' expressions.  While that
is true during macro-expansion, this function may also be called from a
prefix's `:setup-children' function, in which case we also have to deal
with byte-code function objects and compiled functions.

So go back to handle everything for which `commandp' returns non-nil,
except for strings, which Transient does not support as commands.

Because none of command types supported here have to be quoted, we can
keep the part of [1: fb88f803], which stopped using `macroexp-quote'.

Closes #313.
Closes tarsius/notmuch-transient#2.

1: 2024-09-02 fb88f803e85fa0b9e1319e90b5e71020b6543d94
   transient--parse-suffix: Clarify clause, removing dead code

1 files changed, 8 insertions, 0 deletions

diff --git a/CHANGELOG b/CHANGELOG
index 269d157..914afc2 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,4 +1,12 @@
 # -*- mode: org -*-
+* v0.7.7    UNRELEASED
+
+Bug fix:
+
+- Fix a regression introduced by the previous commit, which broke
+  dynamic prefixes that use a ~:setup-children~ function to prepare
+  their suffixes.  #313
+
 * v0.7.6    2024-10-01
 
 - ~transient-active-prefix~ now accepts a single prefix symbol, in place