Implemented Find-Replace Overlay.

In response to issue #1090. Goals for this overlay are a simple
and modern UI/UX for finding/replacing in eclipse.

bundles/org.eclipse.ui.editors/src/org/eclipse/ui/internal/editors/text/TextEditorDefaultsPreferencePage.java

@@ -428,6 +428,7 @@ private OverlayPreferenceStore createDialogOverlayStore() {
 			ArrayList<OverlayKey> overlayKeys= new ArrayList<>();
 
 			overlayKeys.add(new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.BOOLEAN, AbstractDecoratedTextEditorPreferenceConstants.EDITOR_SHOW_LEADING_SPACES));
+			overlayKeys.add(new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.BOOLEAN, "usefindreplaceoverlay"));
 			overlayKeys.add(new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.BOOLEAN, AbstractDecoratedTextEditorPreferenceConstants.EDITOR_SHOW_ENCLOSED_SPACES));
 			overlayKeys.add(new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.BOOLEAN, AbstractDecoratedTextEditorPreferenceConstants.EDITOR_SHOW_TRAILING_SPACES));
 			overlayKeys.add(new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.BOOLEAN, AbstractDecoratedTextEditorPreferenceConstants.EDITOR_SHOW_LEADING_IDEOGRAPHIC_SPACES));
@@ -729,6 +730,7 @@ private OverlayPreferenceStore createOverlayStore() {
 		overlayKeys.add(new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.STRING, AbstractTextEditor.PREFERENCE_COLOR_FIND_SCOPE));
 
 		overlayKeys.add(new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.STRING, AbstractDecoratedTextEditorPreferenceConstants.EDITOR_CURRENT_LINE_COLOR));
+		overlayKeys.add(new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.BOOLEAN, "usefindreplaceoverlay")); //$NON-NLS-1$
 		overlayKeys.add(new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.BOOLEAN, AbstractDecoratedTextEditorPreferenceConstants.EDITOR_CURRENT_LINE));
 
 		overlayKeys.add(new OverlayPreferenceStore.OverlayKey(OverlayPreferenceStore.INT, AbstractDecoratedTextEditorPreferenceConstants.EDITOR_TAB_WIDTH));
@@ -859,6 +861,10 @@ public void widgetSelected(SelectionEvent e) {
 		IntegerDomain lineSpaceDomain= new IntegerDomain(0, 1000);
 		addTextField(appearanceComposite, lineSpacing, lineSpaceDomain, 15, 0);
 
+		label= "Use modern Find/Replace-Overlay"; //$NON-NLS-1$
+		Preference useFindReplaceOverlay= new Preference("usefindreplaceoverlay", label, null); //$NON-NLS-1$
+		addCheckBox(appearanceComposite, useFindReplaceOverlay, new BooleanDomain(), 0);
+
 		label= TextEditorMessages.TextEditorPreferencePage_enableWordWrap;
 		Preference enableWordWrap= new Preference(AbstractTextEditor.PREFERENCE_WORD_WRAP_ENABLED, label, null);
 		addCheckBox(appearanceComposite, enableWordWrap, new BooleanDomain(), 0);

bundles/org.eclipse.ui.editors/src/org/eclipse/ui/texteditor/AbstractDecoratedTextEditorPreferenceConstants.java

@@ -723,6 +723,7 @@ private AbstractDecoratedTextEditorPreferenceConstants() {
 	* @param store the preference store to be initialized
 	*/
 	public static void initializeDefaultValues(IPreferenceStore store) {
+		store.setDefault("usefindreplaceoverlay", false); //$NON-NLS-1$
 		store.setDefault(AbstractDecoratedTextEditorPreferenceConstants.USE_ANNOTATIONS_PREFERENCE_PAGE, false);
 		store.setDefault(AbstractDecoratedTextEditorPreferenceConstants.USE_QUICK_DIFF_PREFERENCE_PAGE, false);
 
@@ -736,6 +737,7 @@ public static void initializeDefaultValues(IPreferenceStore store) {
 
 		store.setDefault(AbstractDecoratedTextEditorPreferenceConstants.EDITOR_UNDO_HISTORY_SIZE, 200);
 
+		store.setDefault("usefindreplaceoverlay", false);
 		store.setDefault(AbstractDecoratedTextEditorPreferenceConstants.EDITOR_PRINT_MARGIN, false);
 		store.setDefault(AbstractDecoratedTextEditorPreferenceConstants.EDITOR_PRINT_MARGIN_COLUMN, 80);
 		store.setDefault(AbstractDecoratedTextEditorPreferenceConstants.EDITOR_PRINT_MARGIN_ALLOW_OVERRIDE, false);

bundles/org.eclipse.ui.workbench.texteditor/src/org/eclipse/ui/internal/findandreplace/FindReplaceLogicFindAllStatus.java

@@ -0,0 +1,35 @@
+/*******************************************************************************
+ * Copyright (c) 2023 Vector Informatik GmbH and others.
+ *
+ * This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License 2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *     Vector Informatik GmbH - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.ui.internal.findandreplace;
+
+public class FindReplaceLogicFindAllStatus implements IFindReplaceLogicStatus {
+	private int selectCount;
+
+	public FindReplaceLogicFindAllStatus(int selectCount) {
+		if (selectCount <= 0) {
+			// invalid value - what to do? Throw an exception?! @HeikoKlare
+		}
+		this.selectCount = selectCount;
+	}
+
+	public int getSelectCount() {
+		return selectCount;
+	}
+
+	@Override
+	public <T> T visit(IFindReplaceLogicStatusVisitor<T> visitor) {
+		return visitor.visit(this);
+	}
+
+}

bundles/org.eclipse.ui.workbench.texteditor/src/org/eclipse/ui/internal/findandreplace/FindReplaceLogicMessage.java

@@ -0,0 +1,40 @@
+/*******************************************************************************
+ * Copyright (c) 2023 Vector Informatik GmbH and others.
+ *
+ * This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License 2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *     Vector Informatik GmbH - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.ui.internal.findandreplace;
+
+/**
+ * Avoid using this class. It is used as a glue to correctly map to the
+ * error-messages generated by RegEx-Errors which are directly displayed in
+ * plain text.
+ *
+ * Prefer using and extending {@link FindReplaceLogicStatus}
+ */
+public class FindReplaceLogicMessage implements IFindReplaceLogicStatus {
+
+	private String message;
+
+	public FindReplaceLogicMessage(String message) {
+		this.message = message;
+	}
+
+	public String getMessage() {
+		return message;
+	}
+
+	@Override
+	public <T> T visit(IFindReplaceLogicStatusVisitor<T> visitor) {
+		return visitor.visit(this);
+	}
+
+}

bundles/org.eclipse.ui.workbench.texteditor/src/org/eclipse/ui/internal/findandreplace/FindReplaceLogicReplaceAllStatus.java

@@ -0,0 +1,32 @@
+/*******************************************************************************
+ * Copyright (c) 2023 Vector Informatik GmbH and others.
+ *
+ * This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License 2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *     Vector Informatik GmbH - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.ui.internal.findandreplace;
+
+public class FindReplaceLogicReplaceAllStatus implements IFindReplaceLogicStatus {
+	private int replaceCount;
+
+	public FindReplaceLogicReplaceAllStatus(int replaceCount) {
+		this.replaceCount = replaceCount;
+	}
+
+	public int getReplaceCount() {
+		return replaceCount;
+	}
+
+	@Override
+	public <T> T visit(IFindReplaceLogicStatusVisitor<T> visitor) {
+		return visitor.visit(this);
+	}
+
+}

bundles/org.eclipse.ui.workbench.texteditor/src/org/eclipse/ui/internal/findandreplace/FindReplaceLogicStatus.java

@@ -0,0 +1,38 @@
+/*******************************************************************************
+ * Copyright (c) 2023 Vector Informatik GmbH and others.
+ *
+ * This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License 2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *     Vector Informatik GmbH - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.ui.internal.findandreplace;
+
+public class FindReplaceLogicStatus implements IFindReplaceLogicStatus {
+
+	public enum MessageCode {
+		NO_MATCH,
+		NONE, WRAPPED, READONLY,
+	}
+
+	private MessageCode messageCode;
+
+	public FindReplaceLogicStatus(MessageCode errorCode) {
+		this.messageCode = errorCode;
+	}
+
+	public MessageCode getMessageCode() {
+		return messageCode;
+	}
+
+	@Override
+	public <T> T visit(IFindReplaceLogicStatusVisitor<T> visitor) {
+		return visitor.visit(this);
+	}
+
+}

bundles/org.eclipse.ui.workbench.texteditor/src/org/eclipse/ui/internal/findandreplace/IFindReplaceLogicStatus.java

@@ -0,0 +1,22 @@
+/*******************************************************************************
+ * Copyright (c) 2023 Vector Informatik GmbH and others.
+ *
+ * This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License 2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *     Vector Informatik GmbH - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.ui.internal.findandreplace;
+
+/**
+ * Marker interface for all Status-objects that a Find/Replace-Operation could
+ * return
+ */
+public interface IFindReplaceLogicStatus {
+	public <T> T visit(IFindReplaceLogicStatusVisitor<T> visitor);
+}

bundles/org.eclipse.ui.workbench.texteditor/src/org/eclipse/ui/internal/findandreplace/IFindReplaceLogicStatusVisitor.java

@@ -0,0 +1,27 @@
+/*******************************************************************************
+ * Copyright (c) 2023 Vector Informatik GmbH and others.
+ *
+ * This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License 2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *     Vector Informatik GmbH - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.ui.internal.findandreplace;
+
+public interface IFindReplaceLogicStatusVisitor<T> {
+	public T visit(IFindReplaceLogicStatus status);
+
+	public T visit(FindReplaceLogicReplaceAllStatus status);
+
+	public T visit(FindReplaceLogicStatus status);
+
+	public T visit(FindReplaceLogicMessage status);
+
+	public T visit(FindReplaceLogicFindAllStatus status);
+
+}