Bug 1310912 - Part 6. Add redo test. r=masayuki

MozReview-Commit-ID: 5TgGAq3tM01

--HG--
extra : rebase_source : 031c1687887b67892ac4c9569fe843c17d5b1a49
extra : histedit_source : 3006cca58c3c5736ab603f3088296272db9763ed

editor/libeditor/tests/test_bug1310912.html

@@ -24,11 +24,6 @@ SimpleTest.waitForExplicitFinish();
 SimpleTest.waitForFocus(function() {
   let elm = document.getElementById("editable1");
 
-  elm.addEventListener("input", () => {
-    let range = window.getSelection().getRangeAt(0);
-    range.insertNode(document.createTextNode(""));
-  });
-
   elm.focus();
   let sel = window.getSelection();
   sel.collapse(elm.childNodes[0], elm.textContent.length);
@@ -44,6 +39,7 @@ SimpleTest.waitForFocus(function() {
   });
   ok(elm.textContent == "ABCDEF", "composing text should be set");
 
+  window.getSelection().getRangeAt(0).insertNode(document.createTextNode(""));
   synthesizeCompositionChange({
     composition: {
       string: "GHI",
@@ -55,6 +51,7 @@ SimpleTest.waitForFocus(function() {
   });
   ok(elm.textContent == "ABCGHI", "composing text should be replaced");
 
+  window.getSelection().getRangeAt(0).insertNode(document.createTextNode(""));
   synthesizeCompositionChange({
     composition: {
       string: "JKL",
@@ -66,6 +63,7 @@ SimpleTest.waitForFocus(function() {
   });
   ok(elm.textContent == "ABCJKL", "composing text should be replaced");
 
+  window.getSelection().getRangeAt(0).insertNode(document.createTextNode(""));
   synthesizeCompositionChange({
     composition: {
       string: "MNO",
@@ -77,12 +75,16 @@ SimpleTest.waitForFocus(function() {
   });
   ok(elm.textContent == "ABCMNO", "composing text should be replaced");
 
+  window.getSelection().getRangeAt(0).insertNode(document.createTextNode(""));
   synthesizeComposition({ type: "compositioncommitasis" });
   ok(elm.textContent == "ABCMNO", "composing text should be committed");
 
   synthesizeKey("Z", { accelKey: true });
   ok(elm.textContent == "ABC", "text should be undoed");
 
+  synthesizeKey("Z", { accelKey: true, shiftKey: true });
+  ok(elm.textContent == "ABCMNO", "text should be redoed");
+
   SimpleTest.finish();
 });
 </script>