test_sendSelectionSetEvent_after_reframe.html

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<!doctype html>

<meta charset="utf-8">

<title>Testing nsIDOMWindowUtils.sendSelectionSetEvent works after the editor's selection controller is recreated (bug 2029505)</title>

<script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>

<link rel="stylesheet" href="chrome://mochikit/content/tests/SimpleTest/test.css"/>

<script>

"use strict";

SimpleTest.waitForExplicitFinish();

SimpleTest.waitForFocus(async () => {

  const flex = document.getElementById("flex");

  const input = flex.querySelector("input");

  function waitForFlushingIMEContentObserver() {

    return new Promise(resolve => requestAnimationFrame(

      () => requestAnimationFrame(resolve)

));

  input.focus();

  input.setSelectionRange(input.value.length, input.value.length);

  await waitForFlushingIMEContentObserver();

  // Force the input to be reframed.  This can cause the focused editor's

  // selection controller to be recreated while the editor itself survives.

  flex.getBoundingClientRect();

  flex.style.display = "flex";

  flex.getBoundingClientRect();

  flex.style.display = "";

  flex.getBoundingClientRect();

  await waitForFlushingIMEContentObserver();

  const ret = windowUtils.sendSelectionSetEvent(

    1, 3,

    SpecialPowers.Ci.nsIDOMWindowUtils.SELECTION_SET_FLAG_USE_NATIVE_LINE_BREAK

);

  ok(ret, "sendSelectionSetEvent should succeed");

  is(input.selectionStart, 1,

     "selectionStart should be updated after reframe");

  is(input.selectionEnd, 4,

     "selectionEnd should be updated after reframe");

  SimpleTest.finish();

});

</script>

<div id="flex">

  <input value="test123">

</div>