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
InfixExpression switchCaseCondition= createSwitchCaseCondition(ast, rewrite, switchStatement, switchCase);
				if (currentCondition == null) {
					currentCondition= switchCaseCondition;
				} else {
					InfixExpression condition= ast.newInfixExpression();
					condition.setOperator(InfixExpression.Operator.CONDITIONAL_OR);
					condition.setLeftOperand(currentCondition);
					condition.setRightOperand(switchCaseCondition);
					currentCondition= condition;
				}
			} else if (statement instanceof BreakStatement) {
				currentBlock= null;
			} else {
				
				if (currentBlock == null) {
					defaultFound= false;
					if (currentCondition != null) {
						IfStatement ifStatement;
						if (firstIfStatement == null) {
							firstIfStatement= ast.newIfStatement();
							ifStatement= firstIfStatement;
						} else {
							ifStatement= ast.newIfStatement();
							currentIfStatement.setElseStatement(ifStatement);
						}
						currentIfStatement= ifStatement;
						ifStatement.setExpression(currentCondition);
						currentCondition= null;
						currentBlock= ast.newBlock();