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code/g3soft-libs/packages/ui/probe-scroll.mjs

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+import { chromium } from '@playwright/test'
+
+/**
+ * 真实场景：内容多、需要垂直滚动。
+ * 用 table-big-wrap（5000 行虚拟滚动）与 table-wrap 塞满行两种方式，
+ * 看底部到底是几条线、以及滚动到不同位置时是否稳定。
+ */
+const BASE = process.env.PROBE_URL || 'http://localhost:5200'
+const browser = await chromium.launch()
+const page = await browser.newPage({ viewport: { width: 1400, height: 1200 } })
+await page.goto(BASE, { waitUntil: 'networkidle' })
+
+const clipSample = async (x, y, w, h) => {
+  const shot = await page.screenshot({ clip: { x, y, width: w, height: h } })
+  return page.evaluate(async (dataUrl) => {
+    const img = new Image()
+    await new Promise((res) => {
+      img.onload = res
+      img.src = dataUrl
+    })
+    const cv = document.createElement('canvas')
+    cv.width = img.width
+    cv.height = img.height
+    const ctx = cv.getContext('2d')
+    ctx.drawImage(ctx.canvas, 0, 0)
+    ctx.drawImage(img, 0, 0)
+    const d = ctx.getImageData(0, 0, img.width, img.height).data
+    const out = []
+    for (let i = 0; i < d.length; i += 4) out.push([d[i], d[i + 1], d[i + 2]])
+    return out
+  }, `data:image/png;base64,${shot.toString('base64')}`)
+}
+
+const probe = async (testid, label) => {
+  const el = page.locator(`[data-testid="${testid}"]`)
+  await el.scrollIntoViewIfNeeded()
+  await page.waitForTimeout(300)
+
+  const g = await el.evaluate((wrap) => {
+    const root = wrap.querySelector('.g3-table')
+    const inner = wrap.querySelector('.stk-table')
+    const r = root.getBoundingClientRect()
+    return {
+      left: Math.round(r.left),
+      bottom: Math.round(r.bottom),
+      rootCls: root.className,
+      overflow: inner.scrollHeight > inner.clientHeight + 1,
+      scrollH: inner.scrollHeight,
+      clientH: inner.clientHeight,
+      rowCount: wrap.querySelectorAll('.stk-tbody-main tr').length,
+    }
+  })
+
+  const y = Math.max(0, g.bottom - 4)
+  if (1200 - y < 10) {
+    console.log(`${label}: 采样超出视口 (bottom=${g.bottom})`)
+    return
+  }
+  const px = await clipSample(g.left + 300, y, 1, 10)
+  const vec = px.map(([r, gg, b]) => (r < 246 || gg < 246 || b < 246 ? 1 : 0))
+  const n = vec.reduce((a, b) => a + b, 0)
+  console.log(
+    `${label.padEnd(18)} overflow=${String(g.overflow).padStart(5)} (${g.scrollH}/${g.clientH}) rows=${String(g.rowCount).padStart(3)} 底部 ${vec.join('')} (${n}条) ${n === 1 ? '✅' : '❌'}  bodyFill=${g.rootCls.includes('is-body-fill')}`,
+  )
+}
+
+console.log('===== 现有 playground 表格 =====')
+for (const [id, label] of [
+  ['table-wrap', 'table-wrap(3行)'],
+  ['table-big-wrap', 'table-big(5000行)'],
+  ['table-plain-wrap', 'table-plain(2行)'],
+  ['table-fixed-wrap', 'table-fixed'],
+]) {
+  if ((await page.locator(`[data-testid="${id}"]`).count()) === 0) continue
+  await probe(id, label)
+}
+
+await browser.close()