runelite-client: always render tooltips on top

Add dedicated overlay position for tooltips to make them on top of all other overlays

runelite-client/src/main/java/net/runelite/client/ui/overlay/OverlayPosition.java

@@ -49,5 +49,9 @@ public enum OverlayPosition
 	/**
 	 * Place overlay directly above right most area of chatbox possible
 	 */
-	ABOVE_CHATBOX_RIGHT;
+	ABOVE_CHATBOX_RIGHT,
+	/**
+	 * Tooltip overlay
+	 */
+	TOOLTIP;
 }

runelite-client/src/main/java/net/runelite/client/ui/overlay/OverlayRenderer.java

@@ -110,7 +110,7 @@ public class OverlayRenderer
 			overlays.removeAll(event.getPlugin().getOverlays());
 		}
 
-		sortOverlays();
+		sortOverlays(overlays);
 	}
 
 	private void refreshPlugins()
@@ -123,10 +123,10 @@ public class OverlayRenderer
 					.flatMap(plugin -> plugin.getOverlays().stream()),
 				Stream.of(infoBoxOverlay, tooltipOverlay))
 			.collect(Collectors.toList()));
-		sortOverlays();
+		sortOverlays(overlays);
 	}
 
-	private void sortOverlays()
+	static void sortOverlays(List<Overlay> overlays)
 	{
 		overlays.sort((a, b) ->
 		{
@@ -235,7 +235,7 @@ public class OverlayRenderer
 						break;
 				}
 
-				if (overlayPosition.equals(OverlayPosition.DYNAMIC))
+				if (overlayPosition == OverlayPosition.DYNAMIC || overlayPosition == OverlayPosition.TOOLTIP)
 				{
 					safeRender(overlay, graphics, new Point());
 				}

runelite-client/src/main/java/net/runelite/client/ui/overlay/tooltip/TooltipOverlay.java

@@ -44,7 +44,7 @@ public class TooltipOverlay extends Overlay
 	@Inject
 	public TooltipOverlay(TooltipManager tooltipManager, Provider<Client> clientProvider)
 	{
-		setPosition(OverlayPosition.DYNAMIC);
+		setPosition(OverlayPosition.TOOLTIP);
 		setPriority(OverlayPriority.HIGH);
 		this.tooltipManager = tooltipManager;
 		this.clientProvider = clientProvider;