Add Option to add Space Before Lambda Empty Parenthesis

This change introduces a dedicated formatter option to control spacing
before lambda empty parameter parentheses. Lambda formatting is now
handled independently, ensuring method declaration settings no longer
affect lambda expressions.

Author: SougandhS

org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/formatter/FormatterMessages.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2000, 2025 IBM Corporation and others.
+ * Copyright (c) 2000, 2026 IBM Corporation and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
@@ -531,6 +531,7 @@ private FormatterMessages() {
 	public static String ModifyDialogTabPage_error_msg_values_items_text_unassigned;
 	public static String ModifyDialogTabPage_NumberPreference_error_invalid_key;
 	public static String ModifyDialogTabPage_NumberPreference_error_invalid_value;
+	public static String FormatterModifyDialog_whiteSpace_pref_before_lambda_empty_param;
 
 	static {
 		NLS.initializeMessages(BUNDLE_NAME, FormatterMessages.class);

org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/formatter/FormatterMessages.properties

@@ -1,5 +1,5 @@
 ###############################################################################
-# Copyright (c) 2000, 2025 IBM Corporation and others.
+# Copyright (c) 2000, 2026 IBM Corporation and others.
 #
 # This program and the accompanying materials
 # are made available under the terms of the Eclipse Public License 2.0
@@ -204,6 +204,7 @@ FormatterModifyDialog_whiteSpace_tree_records=Records
 FormatterModifyDialog_whiteSpace_tree_return='return'
 FormatterModifyDialog_whiteSpace_tree_throw='throw'
 FormatterModifyDialog_whiteSpace_tree_lambda=Lambda
+FormatterModifyDialog_whiteSpace_pref_before_lambda_empty_param=Before lambda empty parentheses
 
 
 FormatterModifyDialog_lineWrap_pref_catch='multi-catch'

org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/formatter/FormatterModifyDialog.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2000, 2025 IBM Corporation and others.
+ * Copyright (c) 2000, 2026 IBM Corporation and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
@@ -1128,7 +1128,8 @@ private void createWhiteSpaceTree() {
 								.pref(FormatterMessages.FormatterModifyDialog_whiteSpace_pref_before_opening_brace_in_record_constructor, DefaultCodeFormatterConstants.FORMATTER_INSERT_SPACE_BEFORE_OPENING_BRACE_IN_RECORD_CONSTRUCTOR))
 						.node(fTree.builder(FormatterMessages.FormatterModifyDialog_whiteSpace_tree_lambda, "-lambdas", modAll) //$NON-NLS-1$
 								.pref(FormatterMessages.FormatterModifyDialog_whiteSpace_pref_before_arrow_operator, DefaultCodeFormatterConstants.FORMATTER_INSERT_SPACE_BEFORE_LAMBDA_ARROW)
-								.pref(FormatterMessages.FormatterModifyDialog_whiteSpace_pref_after_arrow_operator, DefaultCodeFormatterConstants.FORMATTER_INSERT_SPACE_AFTER_LAMBDA_ARROW)))
+								.pref(FormatterMessages.FormatterModifyDialog_whiteSpace_pref_after_arrow_operator, DefaultCodeFormatterConstants.FORMATTER_INSERT_SPACE_AFTER_LAMBDA_ARROW)
+								.pref(FormatterMessages.FormatterModifyDialog_whiteSpace_pref_before_lambda_empty_param, DefaultCodeFormatterConstants.FORMATTER_INSERT_SPACE_BEFORE_LAMBDA_EMPTY_PARENTHESES)))
 				.node(fTree.builder(FormatterMessages.FormatterModifyDialog_whiteSpace_tree_statements, "-statements", modAll) //$NON-NLS-1$
 						.node(fTree.builder(FormatterMessages.FormatterModifyDialog_whiteSpace_tree_blocks, "-blocks", modAll) //$NON-NLS-1$
 								.pref(FormatterMessages.FormatterModifyDialog_whiteSpace_pref_before_opening_brace, DefaultCodeFormatterConstants.FORMATTER_INSERT_SPACE_BEFORE_OPENING_BRACE_IN_BLOCK)