clientui: client focus

add back

runelite-client/src/main/java/net/runelite/client/ui/ClientUI.java

@@ -613,6 +613,35 @@ public class ClientUI
 			OSXUtil.requestFocus();
 		}
 		
+		// The workaround for Windows is to minimise and then un-minimise the client to bring
+		// it to the front because java.awt.Window#toFront doesn't work reliably.
+		// See https://stackoverflow.com/questions/309023/how-to-bring-a-window-to-the-front/7435722#7435722
+		else if (OSType.getOSType() == OSType.Windows && !frame.isFocused())
+		{
+			SwingUtilities.invokeLater(() ->
+			{
+				if ((frame.getExtendedState() & JFrame.MAXIMIZED_BOTH) == JFrame.MAXIMIZED_BOTH)
+				{
+					frame.setExtendedState(JFrame.ICONIFIED);
+					frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
+				}
+				else
+				{
+					// If the client is snapped to the top and bottom edges of the screen, setExtendedState will
+					// will reset it so setSize and setLocation ensure that the client doesn't move or resize.
+					// It is done this way because Windows does not support JFrame.MAXIMIZED_VERT
+					int x = frame.getLocation().x;
+					int y = frame.getLocation().y;
+					int width = frame.getWidth();
+					int height = frame.getHeight();
+					frame.setExtendedState(JFrame.ICONIFIED);
+					frame.setExtendedState(JFrame.NORMAL);
+					frame.setLocation(x, y);
+					frame.setSize(width, height);
+				}
+			});
+		}
+
 		frame.requestFocus();
 		giveClientFocus();
 	}