Bug 40772 [plan item] Smart tab on empty lines
When having the caret on an empty line, pressing tab cleans up the line and sets the caret it the right indentation column.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/CompilationUnitEditor.java
return '\\';
			default:
				return 0;
		}
	}
	
	private static char getPeerCharacter(char character) {
		switch (character) {
			case '(':
				return ')';
				
			case ')':
				return '(';
				
			case '[':
				return ']';
			case ']':
				return '[';
				
			case '"':
				return character;
				
			case '\'':
				return character;
			
			default:
				throw new IllegalArgumentException();
		}					
	}