Windows: Allow IME input in plugins

modules/juce_gui_basics/native/juce_Windowing_windows.cpp

@@ -2336,18 +2336,43 @@ public:
 
     static bool offerKeyMessageToJUCEWindow (MSG& m)
     {
-        if (m.message == WM_KEYDOWN || m.message == WM_KEYUP)
+        auto* peer = getOwnerOfWindow (m.hwnd);
+
+        if (peer == nullptr)
+            return false;
+
+        auto* focused = Component::getCurrentlyFocusedComponent();
+
+        if (focused == nullptr || focused->getPeer() != peer)
+            return false;
+
+        constexpr UINT keyMessages[] { WM_KEYDOWN,
+                                       WM_KEYUP,
+                                       WM_SYSKEYDOWN,
+                                       WM_SYSKEYUP,
+                                       WM_CHAR };
+
+        const auto messageTypeMatches = [&] (UINT msg) { return m.message == msg; };
+
+        if (std::none_of (std::begin (keyMessages), std::end (keyMessages), messageTypeMatches))
+            return false;
+
+        ScopedThreadDPIAwarenessSetter threadDpiAwarenessSetter { m.hwnd };
+
+        if (m.message == WM_CHAR)
+            return peer->doKeyChar ((int) m.wParam, m.lParam);
+
+        TranslateMessage (&m);
+
+        switch (m.message)
         {
-            if (Component::getCurrentlyFocusedComponent() != nullptr)
-            {
-                if (auto* peer = getOwnerOfWindow (m.hwnd))
-                {
-                    ScopedThreadDPIAwarenessSetter threadDpiAwarenessSetter { m.hwnd };
+            case WM_KEYDOWN:
+            case WM_SYSKEYDOWN:
+                return peer->doKeyDown (m.wParam);
 
-                    return m.message == WM_KEYDOWN ? peer->doKeyDown (m.wParam)
-                                                   : peer->doKeyUp (m.wParam);
-                }
-            }
+            case WM_KEYUP:
+            case WM_SYSKEYUP:
+                return peer->doKeyUp (m.wParam);
         }
 
         return false;