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 currentCondition= null;
		boolean defaultFound= false;
		int caseCount = 0;
		
		ArrayList allBlocks= new ArrayList();
		
		for (Iterator I= switchStatement.statements().iterator(); I.hasNext();) {
			Statement statement= (Statement) I.next();
			if (statement instanceof SwitchCase) {
				SwitchCase switchCase= (SwitchCase) statement;
				caseCount++;
				
				if (currentBlock != null) {
					if (!hasStopAsLastExecutableStatement) {
						return false;
					}
					currentBlock= null;
				}
				
				if (switchCase.isDefault()) {
					defaultFound= true;
					if (currentCondition != null) {
						
						return false;
					}
					continue;
				}
				if (defaultFound) {
					return false;
				}