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 (isSelectingOperator(left, right, offset, length)) {
			return ASTNodes.getExclusiveEnd(left);
		}
		List extended= infixExpression.extendedOperands();
		for (int i= 0; i < extended.size(); i++) {
			left= right;
			right= (ASTNode) extended.get(i);
			if (isSelectingOperator(left, right, offset, length)) {
				return ASTNodes.getExclusiveEnd(left);
			}
		}
		return -1;
	}
	
	private static boolean getJoinOrIfStatementsProposals(IInvocationContext context, ASTNode covering, ArrayList coveredNodes,
			Collection resultingCollections) {
		Operator orOperator = InfixExpression.Operator.CONDITIONAL_OR;
		if (coveredNodes.size() < 2)
			return false;
		
		String commonThenSource = null;
		for (Iterator I = coveredNodes.iterator(); I.hasNext();) {
			ASTNode node = (ASTNode) I.next();
			if (!(node instanceof IfStatement))
				return false;
			
			IfStatement ifStatement = (IfStatement) node;
			if (ifStatement.getElseStatement() != null)
				return false;