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Test Info:

<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>
<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>
</html>