fix: general bug fixes

src/ui/tests/features/terminal/ios-rapid-typing.test.ts

@@ -0,0 +1,60 @@
+import { afterEach, describe, expect, it } from "vitest";
+import { Terminal } from "@xterm/xterm";
+
+const tick = () => new Promise((resolve) => setTimeout(resolve, 0));
+
+function setTextareaValue(textarea: HTMLTextAreaElement, value: string) {
+  textarea.value = value;
+  textarea.selectionStart = value.length;
+  textarea.selectionEnd = value.length;
+}
+
+// iOS Safari/WKWebView reports keyCode 229 for ordinary software-keyboard
+// input, not just true IME composition, so xterm routes typing through
+// CompositionHelper.keydown -> _handleAnyTextareaChanges instead of the
+// normal keypress path. That handler snapshots the textarea value on
+// keydown, then diffs it against the value a setTimeout(0) later.
+function dispatchIOSKeydown(textarea: HTMLTextAreaElement) {
+  textarea.dispatchEvent(
+    new KeyboardEvent("keydown", { keyCode: 229 } as KeyboardEventInit),
+  );
+}
+
+describe("iOS rapid typing (keyCode 229 outside composition)", () => {
+  let terminal: Terminal | undefined;
+  let container: HTMLDivElement | undefined;
+
+  afterEach(() => {
+    terminal?.dispose();
+    container?.remove();
+    terminal = undefined;
+    container = undefined;
+  });
+
+  it("forwards a mid-word autocorrect rewrite instead of dropping it", async () => {
+    container = document.createElement("div");
+    document.body.appendChild(container);
+    terminal = new Terminal();
+    terminal.open(container);
+
+    const input: string[] = [];
+    terminal.onData((data) => input.push(data));
+
+    const textarea = terminal.textarea!;
+
+    // keydown fires while the textarea still holds the pre-keystroke value;
+    // the browser (or, on iOS, autocorrect) mutates the value afterward.
+    // Autocorrect can rewrite characters earlier in the word, not just
+    // append at the cursor, so the old value is no longer a literal
+    // substring of the new one.
+    dispatchIOSKeydown(textarea);
+    setTextareaValue(textarea, "wrold");
+    await tick();
+
+    dispatchIOSKeydown(textarea);
+    setTextareaValue(textarea, "world");
+    await tick();
+
+    expect(input.join("")).toBe("wrold" + "orld");
+  });
+});