test_bug1358025.html

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<html>

<head>

  <title>Test for bug 1358025</title>

  <script src="/tests/SimpleTest/SimpleTest.js"></script>

  <link rel="stylesheet" type="text/css"

          href="/tests/SimpleTest/test.css" />

</head>

<body>

<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1358025">Mozilla Bug 1358025</a>

<div id="display">

  <input type="text" id="edit">

</div>

<div id="content" style="display: none">

</div>

<pre id="test">

<script class="testbody" type="application/javascript">

SimpleTest.waitForExplicitFinish();

SimpleTest.waitForFocus(() => {

  let input = document.getElementById("edit");

  input.focus();

  let controller =

    SpecialPowers.wrap(input).controllers.getControllerForCommand("cmd_undo");

  // Create undo transaction

  SpecialPowers.wrap(input).setUserInput("XXX");

  SpecialPowers.wrap(input).setUserInput("");

  // Enable undo because this is user input

  SpecialPowers.wrap(input).setUserInput("");

  is(input.value, "", "value is empty");

  ok(controller.isCommandEnabled("cmd_undo"),

     "Undo is enabled by same empty string");

  SpecialPowers.wrap(input).setUserInput("ABC");

  is(input.value, "ABC", "value is ABC");

  ok(controller.isCommandEnabled("cmd_undo"), "Undo is enabled by a string");

  SpecialPowers.wrap(input).setUserInput("ABC");

  is(input.value, "ABC", "value is ABC");

  ok(controller.isCommandEnabled("cmd_undo"), "Undo is enabled by same string");

  SpecialPowers.wrap(input).setUserInput("DEF");

  is(input.value, "DEF", "value is DEF");

  ok(controller.isCommandEnabled("cmd_undo"),

     "Undo is enabled by different string");

  SpecialPowers.wrap(input).setUserInput("");

  is(input.value, "", "value is empty");

  ok(controller.isCommandEnabled("cmd_undo"),

     "Undo is enabled by empty string");

  // disable undo because this is by script

  // But Edge and Chrome still turn on undo when setting empty value from

  // empty value.  So we are same behaviour for this case.

  input.value = "";

  is(input.value, "", "value is empty");

  ok(controller.isCommandEnabled("cmd_undo"),

     "Undo is still enabled by same empty string");

  input.value = "ABC";

  is(input.value, "ABC", "value is ABC");

  ok(!controller.isCommandEnabled("cmd_undo"), "Undo is disabled by a string");

  // When setting same value by script, all browsers (Edge, Safari and Chrome)

  // keep undo state.

  input.value = "";

  SpecialPowers.wrap(input).setUserInput("ABC");

  ok(controller.isCommandEnabled("cmd_undo"), "Undo is enabled");

  input.value = "ABC";

  is(input.value, "ABC", "value is ABC");

  ok(controller.isCommandEnabled("cmd_undo"),

     "Undo is still enabled by same string");

  input.value = "";

  SpecialPowers.wrap(input).setUserInput("ABC");

  ok(controller.isCommandEnabled("cmd_undo"), "Undo is enabled");

  input.value = "DEF";

  is(input.value, "DEF", "value is DEF");

  ok(!controller.isCommandEnabled("cmd_undo"),

     "Undo is disabled by different string");

  input.value = "";

  SpecialPowers.wrap(input).setUserInput("DEF");

  ok(controller.isCommandEnabled("cmd_undo"), "Undo is enabled");

  input.value = "";

  is(input.value, "", "value is empty");

  ok(!controller.isCommandEnabled("cmd_undo"),

     "Undo is disabled by empty string");

  SimpleTest.finish();

}, window);

</script>

</pre>

</body>

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