Add non-strict mode to offset renderer so containers don't limit higher layers

src/main/java/de/johni0702/minecraft/gui/OffsetGuiRenderer.java

@@ -39,10 +39,44 @@ public class OffsetGuiRenderer implements GuiRenderer {
     @NonNull
     private final ReadableDimension size;
 
+    private final boolean strict;
+
+    /**
+     * Creates a new strict offset gui renderer with the same settings as the supplied one.
+     * @see #OffsetGuiRenderer(GuiRenderer, ReadablePoint, ReadableDimension, boolean)
+     * @param renderer The renderer to copy from
+     */
+    public OffsetGuiRenderer(OffsetGuiRenderer renderer) {
+        this(renderer.renderer, renderer.position, renderer.size, true);
+    }
+
+    /**
+     * Create a new offset GUI renderer. All calls to this renderer are forwarded to the parent
+     * renderer with coordinates offset by the specified position.
+     * This also ensures that drawing happens within the specified bounds.
+     * @param renderer The parent renderer
+     * @param position The position of this renderer within the parent (used as is, not copied)
+     * @param size The size of the drawable area (used as is, not copied)
+     */
     public OffsetGuiRenderer(GuiRenderer renderer, ReadablePoint position, ReadableDimension size) {
+        this(renderer, position, size, true);
+    }
+
+
+    /**
+     * Create a new offset GUI renderer. All calls to this renderer are forwarded to the parent
+     * renderer with coordinates offset by the specified position.
+     * If strict is {@code true}, this also ensures that drawing happens within the specified bounds.
+     * @param renderer The parent renderer
+     * @param position The position of this renderer within the parent (used as is, not copied)
+     * @param size The size of the drawable area (used as is, not copied)
+     * @param strict Whether drawing should be forced to be within the drawable area
+     */
+    public OffsetGuiRenderer(GuiRenderer renderer, ReadablePoint position, ReadableDimension size, boolean strict) {
         this.renderer = renderer;
         this.position = position;
         this.size = size;
+        this.strict = strict;
     }
 
     @Override
@@ -58,6 +92,7 @@ public class OffsetGuiRenderer implements GuiRenderer {
 
     @Override
     public void setDrawingArea(int x, int y, int width, int height) {
+        if (!strict) return;
         int x2 = x + width;
         int y2 = y + height;
         // Convert and clamp top and left border

src/main/java/de/johni0702/minecraft/gui/container/AbstractGuiContainer.java

@@ -150,19 +150,22 @@ public abstract class AbstractGuiContainer<T extends AbstractGuiContainer<T>>
         }
         for (final Map.Entry<GuiElement, Pair<ReadablePoint, ReadableDimension>> e : layedOutElements.entrySet()) {
             GuiElement element = e.getKey();
+            boolean strict;
             if (element instanceof ComposedGuiElement) {
                 if (((ComposedGuiElement) element).getMaxLayer() < renderInfo.layer) {
                     continue;
                 }
+                strict = renderInfo.layer == 0;
             } else {
                 if (element.getLayer() != renderInfo.layer) {
                     continue;
                 }
+                strict = true;
             }
             final ReadablePoint ePosition = e.getValue().getLeft();
             final ReadableDimension eSize = e.getValue().getRight();
             try {
-                OffsetGuiRenderer eRenderer = new OffsetGuiRenderer(renderer, ePosition, eSize);
+                OffsetGuiRenderer eRenderer = new OffsetGuiRenderer(renderer, ePosition, eSize, strict);
                 eRenderer.startUsing();
                 e.getKey().draw(eRenderer, eSize, renderInfo.offsetMouse(ePosition.getX(), ePosition.getY())
                         .layer(renderInfo.getLayer() - e.getKey().getLayer()));