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 (keepParentheses) {
			ParenthesizedExpression pe= ast.newParenthesizedExpression();
			pe.setExpression(inversedExpression);
			rewrite.replace(negationExpression, pe, null);
		} else {
			rewrite.replace(negationExpression, inversedExpression, null);
		}
		
		String label= CorrectionMessages.AdvancedQuickAssistProcessor_pushNegationDown;
		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 getBooleanExpression(ASTNode node) {
		if (!(node instanceof Expression)) {
			return null;
		}
		
		StructuralPropertyDescriptor locationInParent= node.getLocationInParent();
		if (locationInParent == QualifiedName.NAME_PROPERTY) {
			node= node.getParent();
			locationInParent= node.getLocationInParent();
		}
		while (locationInParent == ParenthesizedExpression.EXPRESSION_PROPERTY) {
			node= node.getParent();
			locationInParent= node.getLocationInParent();
		}