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
if (!(node instanceof InfixExpression)) {
			return false;
		}
		InfixExpression infixExpression = (InfixExpression) node;
		Operator operator = infixExpression.getOperator();
		if ((operator != InfixExpression.Operator.CONDITIONAL_AND) && (operator != InfixExpression.Operator.AND)
				&& (operator != InfixExpression.Operator.CONDITIONAL_OR) && (operator != InfixExpression.Operator.OR)
				&& (operator != InfixExpression.Operator.EQUALS) && (operator != InfixExpression.Operator.PLUS)
				&& (operator != InfixExpression.Operator.TIMES) && (operator != InfixExpression.Operator.XOR)) {
			return false;
		}
		
		int offset= isOperatorSelected(infixExpression, context.getSelectionOffset(), context.getSelectionLength());
		if (offset == -1) {
			return false;
		}
		
		
		if (resultingCollections == null) {
			return true;
		}
		AST ast = infixExpression.getAST();
		ASTRewrite rewrite = ASTRewrite.create(ast);
		
		Expression leftExpression = null;
		Expression rightExpression = null;
		InfixExpression currentExpression = infixExpression;
		leftExpression= combineOperands(rewrite, leftExpression, infixExpression.getLeftOperand(), true, operator);
		if (infixExpression.getRightOperand().getStartPosition() <= context.getSelectionOffset()) {