Introduce "local" scope in evaluate-commands

When using `eval` a new scope named 'local' gets pushed for the
whole evaluation, this makes it possible to temporarily set
an option/hook/alias...

Local scopes nest so nested evals do work as expected.

Remove the now trivial with-option command

1 files changed, 2 insertions, 0 deletions

diff --git a/src/scope.hh b/src/scope.hh
index 870e1159..b98be7bb 100644
--- a/src/scope.hh
+++ b/src/scope.hh
@@ -36,6 +36,8 @@ public:
     Highlighters&        highlighters()       { return m_highlighters; }
     const Highlighters&  highlighters() const { return m_highlighters; }
 
+    void reparent(Scope& parent);
+
 private:
     friend class GlobalScope;
     Scope() = default;