Answer the a shortcut on a message with one recipient

Reported from the demo: r and f worked in an open conversation and a
did not. The Reply-all link is only drawn for a message with more
than one recipient, and a shortcut presses the control that is there,
so on every other message a found nothing and did nothing. It falls
back to Reply, as Gmail does.

Every test fixture has a single recipient, which is why the specs for
#36 never met a Reply-all link either way.

Refs #36

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -17,6 +17,8 @@ while a dialog or menu is open. On for everyone; Settings → General → Keyboa
 them off per person. No migration.
 [#36](https://github.com/karatektus/pl_mail/issues/36).
 
+`a` replies on a message that has only one recipient, where there is no Reply to all to press.
+
 **A config backup now carries how each person sorts their mail.** Settings → Categories — rules or
 the assistant, whether that overrules the provider's own categories, and whether the inbox has tabs
 at all — was never written into the file, so a restore put everyone back on rules, the provider's

assets/controllers/ui/shortcuts_controller.js

@@ -215,7 +215,14 @@ export default class extends Controller {
             case "b": return this.#act("snooze");
 
             case "r": return this.#press(this.#reading()?.querySelector(OPEN.reply));
-            case "a": return this.#press(this.#reading()?.querySelector(OPEN.replyAll));
+            // Reply to all, and a plain reply where there is nobody else to
+            // include. The Reply-all link is only drawn for a message with more
+            // than one recipient, so on every other message `a` found no button
+            // and did nothing — which reads as a broken key, not as "there is
+            // only one person here". Gmail answers `a` with a reply there too.
+            case "a": return this.#press(
+                this.#reading()?.querySelector(OPEN.replyAll) ?? this.#reading()?.querySelector(OPEN.reply),
+            );
             case "f": return this.#press(this.#reading()?.querySelector(OPEN.forward));
 
             default: return false;

tests/e2e/keyboard-shortcuts.spec.ts

@@ -165,6 +165,25 @@ test.describe("keyboard shortcuts", () => {
         await expect(page.locator("turbo-frame#compose_dock form").first()).toBeVisible();
     });
 
+    /**
+     * `a` answers on every message, not only on one with several recipients.
+     *
+     * Reported from the demo within a day: r and f worked and a did not. The
+     * Reply-all link is only drawn when there is more than one recipient, and
+     * `a` pressed a link that was not there. It replies instead, which is what
+     * "all" comes to when all is one person.
+     */
+    test("a replies even where there is nobody else to reply to", async ({ page }) => {
+        await inbox(page);
+        await mailRow(page, INBOX_SUBJECTS.read).click();
+
+        await expect(page.locator('[data-shortcut="reply"]')).toBeVisible();
+        await expect(page.locator('[data-shortcut="reply-all"]'), "this fixture has one recipient").toHaveCount(0);
+
+        await page.keyboard.press("a");
+        await expect(page.locator(".compose-window").first()).toBeVisible();
+    });
+
     test("switched off, a key is only a key", async ({ page }) => {
         await setShortcuts(page, "Off");