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
}
	private static boolean getIfReturnIntoIfElseAtEndOfVoidMethodProposals(IInvocationContext context, ASTNode covering,
			Collection resultingCollections) {
		Statement coveringStatement = ASTResolving.findParentStatement(covering);
		if (!(coveringStatement instanceof IfStatement)) {
			return false;
		}
		IfStatement ifStatement = (IfStatement) coveringStatement;
		if (ifStatement.getElseStatement() != null) {
			return false;
		}
		
		Statement thenStatement = ifStatement.getThenStatement();
		if (!(thenStatement instanceof Block)) {
			return false;
		}
		Block thenBlock = (Block) thenStatement;
		List thenStatements = thenBlock.statements();
		if (thenStatements.isEmpty() || !(thenStatements.get(thenStatements.size() - 1) instanceof ReturnStatement)) {
			return false;
		}
		
		MethodDeclaration coveringMetod = ASTResolving.findParentMethodDeclaration(covering);
		if (coveringMetod == null) {
			return false;
		}
		Type returnType = coveringMetod.getReturnType2();
		if (!(returnType instanceof PrimitiveType)
				|| ((PrimitiveType) returnType).getPrimitiveTypeCode() != PrimitiveType.VOID)
			return false;