Revert "Merge pull request #1886 from deathbeam/cleanup-sidebar"

This reverts commit f1a6267c9742038bb4a771d350291999c3d8431c, reversing
changes made to 2b24b5eaa28735053823b210618318cbbe2afa56.

runelite-client/src/main/java/net/runelite/client/util/SwingUtil.java

@@ -228,6 +228,17 @@ public class SwingUtil
 		});
 	}
 
+	/**
+	 * Revalidate minimum frame size.
+	 *
+	 * @param frame the frame
+	 */
+	public static void revalidateMinimumSize(final JFrame frame)
+	{
+		// The JFrame only respects minimumSize if it was set by setMinimumSize, for some reason. (atleast on windows/native)
+		frame.setMinimumSize(frame.getLayout().minimumLayoutSize(frame));
+	}
+
 	private static BufferedImage resizeImage(BufferedImage image, int newWidth, int newHeight)
 	{
 		final Image tmp = image.getScaledInstance(newWidth, newHeight, Image.SCALE_SMOOTH);