src/vs/workbench/browser/parts/editor/editorStatus.ts/StateChange/combine
class StateChange:	combine(other: StateChange) {
		this.indentation = this.indentation || other.indentation;
		this.selectionStatus = this.selectionStatus || other.selectionStatus;
		this.mode = this.mode || other.mode;
		this.encoding = this.encoding || other.encoding;
		this.EOL = this.EOL || other.EOL;
		this.tabFocusMode = this.tabFocusMode || other.tabFocusMode;
		this.columnSelectionMode = this.columnSelectionMode || other.columnSelectionMode;
		this.screenReaderMode = this.screenReaderMode || other.screenReaderMode;
		this.metadata = this.metadata || other.metadata;
	}