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
Statement statement = (Statement) I.next();
				statements.add(statement);
			}
		} else {
			statements.add(body);
		}
		return statements;
	}
	private static boolean getInverseConditionProposals(IInvocationContext context, ASTNode covering, ArrayList coveredNodes, Collection resultingCollections) {
		if (coveredNodes.isEmpty()) {
			return false;
		}
		
		final AST ast = covering.getAST();
		final ASTRewrite rewrite = ASTRewrite.create(ast);
		
		boolean hasChanges = false;
		for (Iterator I = coveredNodes.iterator(); I.hasNext();) {
			ASTNode covered = (ASTNode) I.next();
			Expression coveredExpression= getBooleanExpression(covered);
			if (coveredExpression != null) {
				Expression inversedExpression = getInversedBooleanExpression(ast, rewrite, coveredExpression);
				rewrite.replace(coveredExpression, inversedExpression, null);
				hasChanges = true;
			}
		}
		
		if (!hasChanges) {
			return false;
		}