Method update

src/cm/indentGuides.ts:308–351

(update: ViewUpdate)

			}

			update(update: ViewUpdate): void {
				const { view, state } = update;
				let needsRebuild = false;

				if (update.docChanged) {
					this.decorations = this.decorations.map(update.changes);
					this.lineCache.clear();
					needsRebuild = true;
				}

				if (update.viewportChanged) {
					needsRebuild = true;
				}

				const currentTabSize = getTabSize(state);
				const currentIndentUnit = getIndentUnitColumns(state);
				const currentCharWidth = view.defaultCharacterWidth;

				if (
					currentTabSize !== this.lastTabSize ||
					currentIndentUnit !== this.lastIndentUnit
				) {
					this.lastTabSize = currentTabSize;
					this.lastIndentUnit = currentIndentUnit;
					this.lineCache.clear();
					this.styleCache.clear();
					needsRebuild = true;
				}

				if (currentCharWidth !== this.lastCharWidth) {
					this.lastCharWidth = currentCharWidth;
					this.styleCache.clear();
					needsRebuild = true;
				}

				if (needsRebuild) {
					this.decorations = buildDecorations(
						view,
						config,
						this.lineCache,
						this.styleCache,
					);
				}
			}

			destroy(): void {
				this.lineCache.clear();