decouple renderer/events on mac

engine/app_events.cpp

@@ -49,8 +49,10 @@ void App::pick_image(std::function<void(std::string path)> callback)
 #ifdef __IOS__
     [ios_view pick_photo:callback];
 #elif __OSX__
-    std::string path = [osx_view pick_file];
-    callback(path);
+    dispatch_async(dispatch_get_main_queue(), ^{
+        std::string path = [osx_view pick_file];
+        callback(path);
+    });
 #elif __ANDROID__
     //displayKeyboard(and_app, false);
 #elif _WIN32

engine/main.cpp

@@ -577,7 +577,6 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wp, LPARAM lp)
             tasklist.emplace_back([wp] {
                 App::I.key_down(convert_key((int)wp));
             });
-            break;
         }
         break;
     case WM_SYSKEYUP:
@@ -640,7 +639,6 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wp, LPARAM lp)
             tasklist.emplace_back([lp]{
                 App::I.mouse_up(1, (float)GET_X_LPARAM(lp), (float)GET_Y_LPARAM(lp), kEventSource::Mouse);
             });
-            break;
         }
         break;
     case WM_MOUSEWHEEL: