src/vs/editor/browser/widget/codeEditorWidget.ts/EditorContextKeysManager/_updateFromConfig
class EditorContextKeysManager:	private _updateFromConfig(): void {
		const options = this._editor.getOptions();

		this._editorTabMovesFocus.set(options.get(EditorOption.tabFocusMode));
		this._editorReadonly.set(options.get(EditorOption.readOnly));
		this._inDiffEditor.set(options.get(EditorOption.inDiffEditor));
		this._editorColumnSelection.set(options.get(EditorOption.columnSelection));
	}