Re-add some of fabric loader's gui classes, as some mods use them.

src/fabric/impl/java/net/fabricmc/loader/impl/gui/FabricGuiEntry.java

@@ -0,0 +1,85 @@
+/*
+ * Copyright 2016 FabricMC
+ * Copyright 2022-2023 QuiltMC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.fabricmc.loader.impl.gui;
+
+import java.awt.GraphicsEnvironment;
+import java.util.function.Consumer;
+
+import org.quiltmc.loader.api.gui.LoaderGuiException;
+import org.quiltmc.loader.api.gui.QuiltLoaderGui;
+import org.quiltmc.loader.api.gui.QuiltLoaderText;
+import org.quiltmc.loader.impl.QuiltLoaderImpl;
+import org.quiltmc.loader.impl.game.GameProvider;
+import org.quiltmc.loader.impl.gui.QuiltGuiEntry;
+import org.quiltmc.loader.impl.util.log.Log;
+import org.quiltmc.loader.impl.util.log.LogCategory;
+
+import net.fabricmc.loader.impl.gui.FabricStatusTree.FabricBasicButtonType;
+import net.fabricmc.loader.impl.gui.FabricStatusTree.FabricStatusTab;
+
+/** @deprecated Replaced by the public APIs in {@link QuiltLoaderGui} */
+@Deprecated
+public class FabricGuiEntry {
+
+	/** Opens the given {@link FabricStatusTree} in a new swing window.
+	 *
+	 * @throws Exception if something went wrong while opening the window. */
+	public static void open(FabricStatusTree tree) throws Exception {
+		QuiltLoaderGui.open(tree.toQuiltWindow());
+	}
+
+	/** @param exitAfter If true then this will call {@link System#exit(int)} after showing the gui, otherwise this will
+	 *            return normally. */
+	public static void displayCriticalError(Throwable exception, boolean exitAfter) {
+		displayError(QuiltLoaderText.translate("").toString(), exception, exitAfter);
+	}
+
+	public static void displayError(String mainText, Throwable exception, boolean exitAfter) {
+		QuiltGuiEntry.displayError(mainText, exception, true, exitAfter);
+	}
+
+	public static void displayError(String mainText, Throwable exception, Consumer<FabricStatusTree> treeCustomiser, boolean exitAfter) {
+		GameProvider provider = QuiltLoaderImpl.INSTANCE.tryGetGameProvider();
+
+		if ((provider == null || provider.canOpenGui()) && !GraphicsEnvironment.isHeadless()) {
+			FabricStatusTree tree = new FabricStatusTree("Quilt Loader " + QuiltLoaderImpl.VERSION, mainText);
+			FabricStatusTab crashTab = tree.addTab(QuiltLoaderText.translate("tab.messages").toString());
+
+			if (exception == null) {
+				exception = new Error("Missing exception!");
+			}
+			crashTab.node.addCleanedException(exception);
+
+			tree.addButton(QuiltLoaderText.translate("button.exit").toString(), FabricBasicButtonType.CLICK_ONCE).makeClose();
+			treeCustomiser.accept(tree);
+			try {
+				QuiltLoaderGui.open(tree.toQuiltWindow());
+			} catch (LoaderGuiException e) {
+				if (exitAfter) {
+					Log.warn(LogCategory.GENERAL, "Failed to open the error gui!", e);
+				} else {
+					throw new RuntimeException("Failed to open the error gui!", e);
+				}
+			}
+		}
+
+		if (exitAfter) {
+			System.exit(1);
+		}
+	}
+}