Do not trigger RegisterModified hooks on register about to be restored

This greatly reduces the amount of hooks triggered.

src/commands.cc

@@ -1818,10 +1818,11 @@ void context_wrap(const ParametersParser& parser, Context& context, StringView d
 
     const auto& register_manager = RegisterManager::instance();
     auto make_register_restorer = [&](char c) {
-        return on_scope_end([&, c, save=register_manager[c].save(context)] {
+        auto& reg = register_manager[c];
+        return on_scope_end([&, c, save=reg.save(context), d=ScopedSetBool{reg.modified_hook_disabled()}] {
             try
             {
-                RegisterManager::instance()[c].restore(context, save);
+                reg.restore(context, save);
             }
             catch (runtime_error& err)
             {

src/register_manager.cc

@@ -11,6 +11,7 @@ namespace Kakoune
 void StaticRegister::set(Context& context, ConstArrayView<String> values, bool)
 {
     m_content.assign(values.begin(), values.end());
+    if (not m_disable_modified_hook)
         context.hooks().run_hook(Hook::RegisterModified, m_name, context);
 }
 
@@ -46,6 +47,7 @@ void HistoryRegister::set(Context& context, ConstArrayView<String> values, bool
     if (current_size > size_limit)
         m_content.erase(m_content.begin(), m_content.begin() + (current_size - size_limit));
 
+    if (not m_disable_modified_hook)
         context.hooks().run_hook(Hook::RegisterModified, m_name, context);
 }
 

src/register_manager.hh

@@ -26,6 +26,11 @@ public:
     using RestoreInfo = Vector<String, MemoryDomain::Registers>;
     RestoreInfo save(const Context& context) { return get(context) | gather<RestoreInfo>(); }
     void restore(Context& context, const RestoreInfo& info) { set(context, info, true); }
+
+    NestedBool& modified_hook_disabled() { return m_disable_modified_hook; }
+
+protected:
+    NestedBool m_disable_modified_hook;
 };
 
 // static value register, which can be modified

src/utils.hh

@@ -107,6 +107,12 @@ struct ScopedSetBool
             m_nested_bool.set();
     }
 
+    ScopedSetBool(ScopedSetBool&& other)
+        : m_nested_bool(other.m_nested_bool), m_condition(other.m_condition)
+    {
+        other.m_condition = false;
+    }
+
     ~ScopedSetBool()
     {
         if (m_condition)