Fix copy and move semantics for DnD proxy handle

src/wine-host/xdnd-proxy.cpp

@@ -166,27 +166,10 @@ WineXdndProxy::Handle::~Handle() noexcept {
 WineXdndProxy::Handle::Handle(const Handle& o) noexcept : proxy(o.proxy) {
     instance_reference_count += 1;
 }
-WineXdndProxy::Handle& WineXdndProxy::Handle::operator=(
-    const Handle& o) noexcept {
-    if (&o != this) {
-        instance_reference_count += 1;
-        proxy = o.proxy;
-    }
 
-    return *this;
+WineXdndProxy::Handle::Handle(Handle&& o) noexcept : proxy(o.proxy) {
-}
-
-WineXdndProxy::Handle::Handle(Handle&& o) noexcept : proxy(std::move(o.proxy)) {
     instance_reference_count += 1;
 }
-WineXdndProxy::Handle& WineXdndProxy::Handle::operator=(Handle&& o) noexcept {
-    if (&o != this) {
-        instance_reference_count += 1;
-        proxy = std::move(o.proxy);
-    }
-
-    return *this;
-}
 
 WineXdndProxy::Handle WineXdndProxy::init_proxy() {
     // We're doing a bit of a hybrid between a COM-style reference counted smart

src/wine-host/xdnd-proxy.h

@@ -60,10 +60,10 @@ class WineXdndProxy {
         ~Handle() noexcept;
 
         Handle(const Handle&) noexcept;
-        Handle& operator=(const Handle&) noexcept;
+        Handle& operator=(const Handle&) noexcept = default;
 
         Handle(Handle&&) noexcept;
-        Handle& operator=(Handle&&) noexcept;
+        Handle& operator=(Handle&&) noexcept = default;
 
        private:
         WineXdndProxy* proxy;