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
* @param expression
	 * @param operator
	 * @param operatorOffset
	 */
	private static void breakInfixOperationAtOperation(ASTRewrite rewrite, Expression expression, Operator operator, int operatorOffset, boolean removeParenthesis, Expression[] res) {
		if (expression.getStartPosition() + expression.getLength() <= operatorOffset) {
			
			res[0]= combineOperands(rewrite, res[0], expression, removeParenthesis, operator);
			return;
		}
		if (operatorOffset <= expression.getStartPosition()) {
			
			res[1]= combineOperands(rewrite, res[1], expression, removeParenthesis, operator);
			return;
		}
		if (!(expression instanceof InfixExpression)) {
			throw new IllegalArgumentException("Cannot break up non-infix expression"); 
		}
		InfixExpression infixExpression= (InfixExpression) expression;
		if (infixExpression.getOperator() != operator) {
			throw new IllegalArgumentException("Incompatible operator"); 
		}
		breakInfixOperationAtOperation(rewrite, infixExpression.getLeftOperand(), operator, operatorOffset, removeParenthesis, res);
		breakInfixOperationAtOperation(rewrite, infixExpression.getRightOperand(), operator, operatorOffset, removeParenthesis, res);	
		
		List extended= infixExpression.extendedOperands();
		for (int i= 0; i < extended.size(); i++) {
			breakInfixOperationAtOperation(rewrite, (Expression) extended.get(i), operator, operatorOffset, removeParenthesis, res);	
		}
	}