File: test_bug1785739.html

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<!DOCTYPE html>
<meta charset="utf-8">
<title>nsFind::Find() should initialize the editor</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" href="/tests/SimpleTest/test.css">
<input value="1abc1
              2abc2
              3abc3
              4abc4
              5abc5
              6abc6
              7abc7
              8abc8
              9abc9" id="input">
<script>
  SimpleTest.waitForExplicitFinish();

  // The current window.find() impl does not support text controls, so import the internal component
  const finder =
    SpecialPowers
      .Cc["@mozilla.org/typeaheadfind;1"]
      .getService(SpecialPowers.Ci.nsITypeAheadFind);

  finder.init(SpecialPowers.wrap(window).docShell);

  function find() {
    return finder.find(
      "abc",
      false,
      SpecialPowers.Ci.nsITypeAheadFind.FIND_NEXT,
      true);
  }

  async function runTests() {
    finder.find("abc", false, SpecialPowers.Ci.nsITypeAheadFind.FIND_FIRST, true);
    // Wait until layout flush as the bug repro needs it
    await new Promise(requestAnimationFrame);

    for (let i = 0; i < 9; i++) {
      find();
      await new Promise(requestAnimationFrame);
      is(input.selectionStart, (i * 19) + 1);
    }

    SimpleTest.finish();
  }
  window.addEventListener("load", runTests);
</script>