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 (resultingCollections == null) {
			return true;
		}
		
		String label = CorrectionMessages.AdvancedQuickAssistProcessor_inverseConditions_description;
		Image image = JavaPluginImages.get(JavaPluginImages.IMG_CORRECTION_CHANGE);
		ASTRewriteCorrectionProposal proposal = new ASTRewriteCorrectionProposal(label, context.getCompilationUnit(),
				rewrite, 1, image);
		resultingCollections.add(proposal);
		return true;
	}
	private static Expression getInversedBooleanExpression(AST ast, ASTRewrite rewrite, Expression expression) {
		return getInversedBooleanExpression(ast, rewrite, expression, null);
	}
	private interface SimpleNameRenameProvider {
		SimpleName getRenamed(SimpleName name);
	}
	private static Expression getRenamedNameCopy(SimpleNameRenameProvider provider,
			ASTRewrite rewrite,
			Expression expression) {
		if (provider != null) {
			if (expression instanceof SimpleName) {
				SimpleName name= (SimpleName) expression;
				SimpleName newName= provider.getRenamed(name);
				if (newName != null) {
					return newName;
				}
			}
		}
		return (Expression) rewrite.createCopyTarget(expression);