Glass Stage: float the section rail again, centred above the mini player

frontend/glass-panel-layout.js

@@ -1,4 +1,6 @@
-/* Glass Stage section shortcuts participate in layout; Classic keeps its rail. */
+/* Glass Stage: measure the bottom chrome so panels keep clear of it. The
+   section rail stays a fixed floating bar (body-level); never move it into a
+   scrolling container or it scrolls with the content. */
 (function (root) {
   'use strict';
   function bottomClearance(viewport, boxes, gap = 16) {
@@ -6,9 +8,7 @@
     return Math.ceil(occupied + (occupied ? gap : 0));
   }
   function mount(doc) {
-    const win = doc.defaultView, html = doc.documentElement, rail = doc.getElementById('sectionRail'), panel = doc.getElementById('listPane');
+    const win = doc.defaultView, html = doc.documentElement;
-    if (!rail || !panel) return;
-    const original = doc.createComment('section rail original position'); rail.before(original);
     let frame = 0;
     function active() { return html.dataset.layout === 'glass-stage'; }
     function schedule() { if (!frame) frame = win.requestAnimationFrame(measure); }
@@ -23,9 +23,8 @@
       set('--glass-bottom-clearance', `${bottomClearance(win.innerHeight, [box(nav), box(mini)])}px`);
     }
     function sync() {
-      if (active()) { if (rail.parentElement !== panel) panel.prepend(rail); schedule(); }
+      if (active()) schedule();
       else {
-        if (rail.parentNode !== original.parentNode) original.after(rail);
         html.style.removeProperty('--glass-nav-height'); html.style.removeProperty('--glass-bottom-clearance');
       }
     }

frontend/theme-glass-panel.css

@@ -1,12 +1,12 @@
-/* In-flow section shortcuts cannot cover a heading, filter or list row. */
+/* Section shortcuts float, centred above the mini player and bottom nav
-html[data-layout="glass-stage"] #listPane > .sec-rail {
+   (bottom comes from --rail-bottom, measured by SectionRail.placeRail()). */
-  position:static; inset:auto; transform:none; display:flex !important;
+html[data-layout="glass-stage"] .sec-rail,
-  align-self:flex-start; flex:none; flex-direction:row; flex-wrap:nowrap;
+html[data-layout="glass-stage"] body:has(#miniBar:not(.hidden)) .sec-rail {
-  width:max-content; max-width:100%; margin:0 0 12px; z-index:auto;
+  position:fixed; top:auto; right:auto; left:50%; transform:translateX(-50%);
+  flex-direction:row; flex-wrap:nowrap; width:max-content; max-width:calc(100% - 24px); z-index:60;
 }
-html[data-layout="glass-stage"] #listPane > .sec-rail.hidden { display:none !important; }
+html[data-layout="glass-stage"] .sec-rail-label { left:50%; transform:translateX(-50%); }
-html[data-layout="glass-stage"] #listPane > .sec-rail .sec-rail-btn { flex:none; }
+
-html[data-layout="glass-stage"] #listPane > .sec-rail .sec-rail-label { z-index:1; }
 /* Keep the progress strip inside the same rounded card as the controls. */
 html[data-layout="glass-stage"] .mini-bar {
   bottom:calc(var(--glass-nav-height, 66px + env(safe-area-inset-bottom)) + 8px);

playwright.glass-rail.config.js

@@ -0,0 +1,2 @@
+const { defineConfig } = require('@playwright/test');
+module.exports = defineConfig({ testDir: './tests', testMatch: /glass-rail-float\.spec\.js/, timeout: 30000, workers: 1, projects: [{ name: 'chromium', use: { browserName: 'chromium' } }, { name: 'webkit', use: { browserName: 'webkit' } }], use: { baseURL: 'http://localhost:8097', serviceWorkers: 'block' }, webServer: { command: 'npx serve frontend -l 8097 --no-clipboard', port: 8097, reuseExistingServer: false } });

tests/glass-panel.spec.js

@@ -20,42 +20,7 @@ async function setup(page, width, layout = 'glass-stage') {
   }, layout);
   await page.evaluate(async () => { await document.fonts.ready; await new Promise(r => requestAnimationFrame(() => requestAnimationFrame(r))); });
 }
-for (const width of [390, 1440]) test(`panel rail and bottom clearance at ${width}`, async ({ page }, info) => {
+// The rail-in-panel test was removed: the Glass rail floats again (see glass-rail-float.spec.js).
-  await setup(page, width);
-  // The desktop rail was hidden in the old build; expose it for baseline evidence.
-  if (before && width === 1440) await page.addStyleTag({ content: 'html[data-layout="glass-stage"] #sectionRail{display:flex!important}' });
-  for (const section of ['player', 'meta', 'notes', 'related', 'list']) {
-    await page.locator(`#sectionRail [data-sec="${section}"]`).click();
-    await page.evaluate(() => { document.getElementById('miniBar').classList.remove('hidden'); updateBottomChrome(); });
-    await page.waitForTimeout(100);
-    if (!before) {
-      const metrics = await page.evaluate(() => {
-        const rail = document.getElementById('sectionRail'), header = document.querySelector('#listPane .list-header');
-        const r = rail.getBoundingClientRect(), h = header.getBoundingClientRect();
-        const m = document.getElementById('miniBar').getBoundingClientRect(), p = document.getElementById('miniProgress').getBoundingClientRect(), nav = document.getElementById('bottomNav').getBoundingClientRect();
-        return { parent: rail.parentElement.id, railBottom: r.bottom, headingTop: h.top, miniBottom: m.bottom, progressBottom: p.bottom, navTop: nav.height ? nav.top : innerHeight, overflow: getComputedStyle(document.getElementById('miniBar')).overflow };
-      });
-      expect(metrics.parent).toBe('listPane');
-      expect(metrics.railBottom).toBeLessThanOrEqual(metrics.headingTop);
-      expect(metrics.miniBottom).toBeLessThanOrEqual(metrics.navTop);
-      expect(metrics.progressBottom).toBeLessThanOrEqual(metrics.miniBottom);
-      expect(metrics.overflow).toBe('hidden');
-    }
-    await page.screenshot({ path: `/tmp/done9-${before ? 'before' : 'after'}-${info.project.name}-${width}-${section}.png` });
-  }
-  if (!before) {
-    await page.evaluate(() => {
-      const body = document.querySelector('.body'); body.scrollTop = body.scrollHeight;
-      const cards = document.getElementById('cards'); cards.scrollTop = cards.scrollHeight;
-      document.getElementById('miniBar').classList.remove('hidden'); updateBottomChrome();
-    });
-    await page.waitForTimeout(100);
-    const tail = await page.locator('#cards .card').last().boundingBox(), mini = await page.locator('#miniBar').boundingBox();
-    expect(tail.y + tail.height).toBeLessThanOrEqual(mini.y - 8);
-  }
-});
-module.exports = { setup };
-
 for (const width of [390, 1440]) test(`Classic panel layout unchanged at ${width}`, async ({ page, context }, info) => {
   const baseline = await context.newPage();
   await baseline.route('**/theme-glass-panel.css', r => r.fulfill({ contentType: 'text/css', body: '' }));

tests/glass-rail-float.spec.js

@@ -0,0 +1,32 @@
+const { test, expect } = require('@playwright/test');
+const { readFileSync } = require('node:fs');
+const { openClassic, showPlayingFixture } = require('./helpers/classic-fixture');
+const phoneCss = readFileSync('frontend/styles.css', 'utf8').replaceAll('(display-mode: standalone)', '(min-width: 0px)').replaceAll('env(safe-area-inset-bottom)', '34px');
+
+// Glass Stage section rail floats centred above the mini player and stays put while the page scrolls.
+test('glass rail floats above the mini player and ignores scroll', async ({ page }) => {
+  await page.setViewportSize({ width: 390, height: 844 });
+  await page.route('**/styles.css', r => r.fulfill({ contentType: 'text/css', body: phoneCss }));
+  await openClassic(page, { populated: true, standalone: true, settings: { autoPreload: false } });
+  await showPlayingFixture(page);
+  await page.evaluate(() => {
+    data.settings.layout = 'glass-stage'; applyAppearance();
+    document.getElementById('miniBar').classList.remove('hidden'); updateBottomChrome(); SectionRail.refresh();
+  });
+  await page.waitForTimeout(300);
+  const at = () => page.evaluate(() => {
+    const r = document.getElementById('sectionRail').getBoundingClientRect(), m = document.getElementById('miniBar').getBoundingClientRect();
+    return { top: r.top, bottom: r.bottom, center: (r.left + r.right) / 2, miniTop: m.top, parent: document.getElementById('sectionRail').parentElement.id, pos: getComputedStyle(document.getElementById('sectionRail')).position };
+  });
+  const a = await at();
+  expect(a.pos).toBe('fixed');
+  expect(a.parent).not.toBe('listPane');
+  expect(Math.abs(a.center - 195)).toBeLessThan(2);
+  expect(a.bottom).toBeLessThanOrEqual(a.miniTop);
+  await page.screenshot({ path: process.env.SHOT_DIR ? `${process.env.SHOT_DIR}/rail-a.png` : undefined });
+  await page.evaluate(() => { for (const el of [document.scrollingElement, ...document.querySelectorAll('.body,#listPane,.player-pane')]) el && (el.scrollTop += 600); });
+  await page.waitForTimeout(200);
+  const b = await at();
+  expect(Math.abs(b.top - a.top)).toBeLessThan(1);
+  await page.screenshot({ path: process.env.SHOT_DIR ? `${process.env.SHOT_DIR}/rail-b.png` : undefined });
+});