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
nodes.add(covering);
		} else {
			nodes= coveredNodes;
		}
		if (nodes.isEmpty())
			return false;
		
		final AST ast= covering.getAST();
		final ASTRewrite rewrite= ASTRewrite.create(ast);
		
		final ArrayList changedNodes= new ArrayList();
		for (Iterator I= nodes.iterator(); I.hasNext();) {
			ASTNode covered= (ASTNode) I.next();
			covered.accept(new ASTVisitor() {
				public void postVisit(ASTNode node) {
					if (!(node instanceof ParenthesizedExpression)) {
						return;
					}
					ParenthesizedExpression parenthesizedExpression= (ParenthesizedExpression) node;
					Expression expression= parenthesizedExpression.getExpression();
					while (expression instanceof ParenthesizedExpression) {
						expression= ((ParenthesizedExpression) expression).getExpression();
					}
					
					if ((parenthesizedExpression.getExpression() instanceof CastExpression)
						&& (parenthesizedExpression.getParent() instanceof MethodInvocation)) {
						MethodInvocation parentMethodInvocation = (MethodInvocation) parenthesizedExpression.getParent();
						if (parentMethodInvocation.getExpression() == parenthesizedExpression)
							return;
					}