src/vs/editor/browser/widget/codeEditorWidget.ts/CodeEditorWidget/_removeDecorationTypes
class CodeEditorWidget:	private _removeDecorationTypes(): void {
		this._decorationTypeKeysToIds = {};
		if (this._decorationTypeSubtypes) {
			for (const decorationType in this._decorationTypeSubtypes) {
				const subTypes = this._decorationTypeSubtypes[decorationType];
				for (const subType in subTypes) {
					this._removeDecorationType(decorationType + '-' + subType);
				}
			}
			this._decorationTypeSubtypes = {};
		}
	}