src/vs/editor/browser/widget/diffEditorWidget.ts/isCharChangeOrDelete
function isCharChangeOrDelete(charChange: ICharChange): boolean {
	if (charChange.originalStartLineNumber === charChange.originalEndLineNumber) {
		return charChange.originalEndColumn - charChange.originalStartColumn > 0;
	}
	return charChange.originalEndLineNumber - charChange.originalStartLineNumber > 0;
}