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 (thenBinding != null && elseBinding != null && exprBinding != null && !elseBinding.isAssignmentCompatible(thenBinding)) {
				CastExpression castException= ast.newCastExpression();
				proposal.createImportRewrite(context.getASTRoot());
				castException.setType(proposal.getImportRewrite().addImport(exprBinding, ast));
				castException.setExpression(elseCopy);
				elseCopy= castException;
			}
		}
		conditionalExpression.setThenExpression(thenCopy);
		conditionalExpression.setElseExpression(elseCopy);
		
		
		if (assigned == null) {
			ReturnStatement returnStatement = ast.newReturnStatement();
			returnStatement.setExpression(conditionalExpression);
			rewrite.replace(ifStatement, returnStatement, null);
		} else {
			Assignment assignment= ast.newAssignment();
			assignment.setLeftHandSide((Expression) rewrite.createCopyTarget(assigned));
			assignment.setRightHandSide(conditionalExpression);
			ExpressionStatement expressionStatement = ast.newExpressionStatement(assignment);
			rewrite.replace(ifStatement, expressionStatement, null);
		}
		
		resultingCollections.add(proposal);
		return true;
	}
	private static ReturnStatement createReturnExpression(ASTRewrite rewrite, Expression expression) {
		AST ast= rewrite.getAST();
		ReturnStatement thenReturn = ast.newReturnStatement();