Bug 120389 [quick fix] replace conditional with if-else removes + from +=
Using Build I20051102-1600. I create a class [snip] package bla; class Bla { void bla() { boolean cond = true; int i = 42; i += ( cond ) ? 1 : 2; } } [snap] Now I move the cursor over the second cond and trigger the Quickfix 'Replace conditional with if-else'. This results in [snip] int i = 42; if (cond) i = 1; else i = 2; [snap] i.e. replaces the '+=' with '='. (Credit to Jordi Boehme for finding this.)
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/correction/AdvancedQuickAssistProcessor.java
outerIf = (IfStatement) block.getParent();
				}
			}
			if ((outerIf != null) && (outerIf.getElseStatement() == null)) {
				if (resultingCollections == null) {
					return true;
				}
				
				AST ast = statement.getAST();
				ASTRewrite rewrite = ASTRewrite.create(ast);
				
				Expression outerCondition = getParenthesizedForAndIfNeeded(ast, rewrite, outerIf.getExpression());
				Expression innerCondition = getParenthesizedForAndIfNeeded(ast, rewrite, ifStatement.getExpression());
				
				InfixExpression condition = ast.newInfixExpression();
				condition.setOperator(andOperator);
				condition.setLeftOperand(outerCondition);
				condition.setRightOperand(innerCondition);
				
				IfStatement newIf = ast.newIfStatement();
				newIf.setExpression(condition);
				Statement bodyPlaceholder = (Statement) rewrite.createCopyTarget(ifStatement.getThenStatement());
				newIf.setThenStatement(bodyPlaceholder);
				rewrite.replace(outerIf, newIf, null);
				
				String label = CorrectionMessages.AdvancedQuickAssistProcessor_joinWithOuter_description;
				Image image = JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_CHANGE);
				ASTRewriteCorrectionProposal proposal = new ASTRewriteCorrectionProposal(label,
						context.getCompilationUnit(), rewrite, 1, image);
				resultingCollections.add(proposal);