Prove Cowork selection preservation portably

Signed-off-by: Joseph Yaksich <gitcommit90@users.noreply.github.com>

Author: gitcommit90

test/brief-regressions-browser.mjs

@@ -145,11 +145,13 @@ try {
       sameNode: editor === window.__briefNoteEditor,
       value: [...document.querySelectorAll('[aria-label="Notes editor"] .cm-line')].map((line) => line.textContent).join("\n"),
       focused: document.activeElement === editor,
-      selection: window.getSelection()?.toString(),
     };
   });
-  ok(durableNote.sameNode && durableNote.value.endsWith("Unsaved words survive.") && durableNote.focused && durableNote.selection === "Durable",
-    "shell refreshes preserve the exact note editor node, unsaved draft, focus, and selection");
+  ok(durableNote.sameNode && durableNote.value === "# Durable note\n\nStart here.\n\nUnsaved words survive." && durableNote.focused,
+    "shell refreshes preserve the exact note editor node, unsaved draft, and focus");
+  await page.keyboard.type("Steady");
+  ok(await page.$eval('[aria-label="Notes editor"] .cm-content', (editor) => editor.textContent.startsWith("# Steady note") && editor.textContent.endsWith("Unsaved words survive.")),
+    "shell refreshes preserve the authoritative CodeMirror selection");
   await page.evaluate(() => [...document.querySelectorAll('.cowork-editor-toolbar button')].find((button) => button.textContent?.trim() === "Preview")?.click());
   await page.waitForSelector('.cowork-markdown-preview:not(.hidden)');
   ok(await page.$eval('.cowork-markdown-preview', (element) => /Unsaved words survive/.test(element.textContent)), "Cowork note preview renders the current unsaved Markdown draft");

test/cowork-browser.mjs

@@ -140,9 +140,11 @@ test("Cowork, Files, Quick Note, Markdown, and mobile continuity work as one fil
   await page.waitForFunction(() => document.querySelector('[aria-label="Notes editor"] .cm-content') === window.__coworkEditor);
   const continuity = await page.evaluate(() => {
     const editor = document.querySelector('[aria-label="Notes editor"] .cm-content');
-    return { same: editor === window.__coworkEditor, focused: document.activeElement === editor, lines: [...document.querySelectorAll('[aria-label="Notes editor"] .cm-line')].map((line) => line.textContent), selection: window.getSelection()?.toString() };
+    return { same: editor === window.__coworkEditor, focused: document.activeElement === editor, lines: [...document.querySelectorAll('[aria-label="Notes editor"] .cm-line')].map((line) => line.textContent) };
   });
-  assert.deepEqual(continuity, { same: true, focused: true, lines: ["# Field notes", "", "**Goal**", "", "Unsaved continuity proof."], selection: "ield not" });
+  assert.deepEqual(continuity, { same: true, focused: true, lines: ["# Field notes", "", "**Goal**", "", "Unsaved continuity proof."] });
+  await page.keyboard.type("PRESERVED");
+  assert.deepEqual(await page.$$eval('[aria-label="Notes editor"] .cm-line', (lines) => lines.map((line) => line.textContent)), ["# FPRESERVEDes", "", "**Goal**", "", "Unsaved continuity proof."]);
   await page.keyboard.down(primaryModifier); await page.keyboard.press("s"); await page.keyboard.up(primaryModifier);
   await waitFor(async () => (await api(`/api/channels/${channel.id}/files/text?path=notes%2Ffield-notes.md`, {}, token)).file.content.includes("Unsaved continuity proof"), "saved Cowork note");