Fix SafeCountable and RefCountable copy/move logic

The safe and ref counts should not get copied around.

src/alias_registry.hh

@@ -11,7 +11,7 @@ namespace Kakoune
 class AliasRegistry : public SafeCountable
 {
 public:
-    AliasRegistry(AliasRegistry& parent) : m_parent(&parent) {}
+    AliasRegistry(AliasRegistry& parent) : SafeCountable{}, m_parent(&parent) {}
     void add_alias(String alias, String command);
     void remove_alias(StringView alias);
     StringView operator[](StringView alias) const;

src/hook_manager.hh

@@ -14,7 +14,7 @@ class Context;
 class HookManager : public SafeCountable
 {
 public:
-    HookManager(HookManager& parent) : m_parent(&parent) {}
+    HookManager(HookManager& parent) : SafeCountable{}, m_parent(&parent) {}
 
     void add_hook(StringView hook_name, String group, Regex filter, String commands);
     void remove_hooks(StringView group);

src/ref_ptr.hh

@@ -8,8 +8,15 @@ namespace Kakoune
 
 struct RefCountable
 {
-    int refcount = 0;
+    RefCountable() = default;
+    RefCountable(const RefCountable&) {}
+    RefCountable(RefCountable&&) {}
     virtual ~RefCountable() = default;
+
+    RefCountable& operator=(const RefCountable&) { return *this; }
+    RefCountable& operator=(RefCountable&&) { return *this; }
+
+    int refcount = 0;
 };
 
 struct RefCountablePolicy

src/safe_ptr.hh

@@ -24,7 +24,7 @@ class SafeCountable
 {
 public:
 #ifdef KAK_DEBUG
-    SafeCountable() : m_count(0) {}
+    SafeCountable() {}
     ~SafeCountable()
     {
         kak_assert(m_count == 0);
@@ -33,6 +33,12 @@ public:
         #endif
     }
 
+    SafeCountable(const SafeCountable&) {}
+    SafeCountable(SafeCountable&&) {}
+
+    SafeCountable& operator=(const SafeCountable& other) { return *this; }
+    SafeCountable& operator=(SafeCountable&& other) { return *this; }
+
 private:
     friend struct SafeCountablePolicy;
     #ifdef SAFE_PTR_TRACK_CALLSTACKS
@@ -45,7 +51,7 @@ private:
 
     mutable Vector<Callstack> m_callstacks;
     #endif
-    mutable int m_count;
+    mutable int m_count = 0;
 #endif
 };