Address feedback

Author: MatkovIvan

skiko/src/awtMain/objectiveC/macos/DisplayLinkThrottler.mm

@@ -92,8 +92,19 @@ - (instancetype)initWithWindow:(NSWindow *)window {
             [self onScreenDidChange];
         } else {
             // In case of OpenJDK, EDT thread != NSThread main thread
+            // There is one thing we should keep in mind. Postponing creation of vsync throttler will cause that for sometime there won't be any waiting:
+            //
+            // ```
+            // create window
+            // (10x) schedule render -> render
+            // onScreenDidChange
+            // schedule render -> wait vsync -> render
+            // ```
+            //
+            // It is probably okay, but possible alternative would be to wait for throttler creation. It is difficult, so we can just keep the current code.
+            __weak DisplayLinkThrottler *weakSelf = self;
             dispatch_async(dispatch_get_main_queue(), ^{
-                [self onScreenDidChange];
+                [weakSelf onScreenDidChange];
             });
         }
     }

skiko/src/awtMain/objectiveC/macos/MetalRedrawer.mm

@@ -127,8 +127,9 @@ static void setWindowProperties(NSWindow* window, jboolean transparency) {
         setWindowPropertiesUnsafe(window, transparency);
     } else {
         // In case of OpenJDK, EDT thread != NSThread main thread
+        __weak NSWindow *weakWindow = window;
         dispatch_sync(dispatch_get_main_queue(), ^{
-        setWindowPropertiesUnsafe(window, transparency);
+            setWindowPropertiesUnsafe(weakWindow, transparency);
         });
     }
 }