Rename [LenientThis] to [LegacyLenientThis]

Part of #350.

Author: domenic

index.bs

@@ -1969,7 +1969,7 @@ are applicable to regular and static attributes:
 The following [=extended attributes=]
 are applicable only to regular attributes:
 [{{LegacyLenientSetter}}],
-[{{LenientThis}}],
+[{{LegacyLenientThis}}],
 [{{PutForwards}}],
 [{{Replaceable}}],
 [{{Unforgeable}}].
@@ -9836,18 +9836,18 @@ See the <a href="#es-attributes">Attributes</a> section for how
 </div>
 
 
-<h4 id="LenientThis" extended-attribute lt="LenientThis">[LenientThis]</h4>
+<h4 id="LegacyLenientThis" extended-attribute lt="LegacyLenientThis" oldids="LenientThis">[LegacyLenientThis]</h4>
 
 <div class="advisement">
 
-    Specifications should not use [{{LenientThis}}]
+    Specifications should not use [{{LegacyLenientThis}}]
     unless required for compatibility reasons.
     Editors who wish to use this feature are strongly advised to discuss this
-    by <a href="https://github.com/heycam/webidl/issues/new?title=Intent%20to%20use%20[LenientThis]">filing an issue</a>
+    by <a href="https://github.com/heycam/webidl/issues/new?title=Intent%20to%20use%20[LegacyLenientThis]">filing an issue</a>
     before proceeding.
 
     <small class="non-normative">
-        The [{{LenientThis}}] [=extended attribute=] appears on
+        The [{{LegacyLenientThis}}] [=extended attribute=] appears on
         the {{Document/onreadystatechange}},
         {{Document/onmouseenter}}, and
         {{Document/onmouseleave}} [=attributes=]
@@ -9856,37 +9856,37 @@ See the <a href="#es-attributes">Attributes</a> section for how
 
 </div>
 
-If the [{{LenientThis}}]
+If the [{{LegacyLenientThis}}]
 [=extended attribute=]
 appears on a [=regular attribute=],
 it indicates that invocations of the attribute’s getter or setter
 with a <emu-val>this</emu-val> value that is not an
 object that [=implements=] the [=interface=]
 on which the attribute appears will be ignored.
 
-The [{{LenientThis}}] extended attribute
+The [{{LegacyLenientThis}}] extended attribute
 must
 [=takes no arguments|take no arguments=].
 It must not be used on a
 [=static attribute=].
 
-The [{{LenientThis}}] extended attribute must not be used on an attribute declared on a
+The [{{LegacyLenientThis}}] extended attribute must not be used on an attribute declared on a
 [=namespace=].
 
 See the <a href="#es-attributes">Attributes</a> section for how
-[{{LenientThis}}]
+[{{LegacyLenientThis}}]
 is to be implemented.
 
 <div class="example">
 
     The following IDL fragment defines an interface that uses the
-    [{{LenientThis}}] extended
+    [{{LegacyLenientThis}}] extended
     attribute.
 
     <pre highlight="webidl">
         [Exposed=Window]
         interface Example {
-          [LenientThis] attribute DOMString x;
+          [LegacyLenientThis] attribute DOMString x;
           attribute DOMString y;
         };
     </pre>
@@ -9903,10 +9903,10 @@ is to be implemented.
         // Fine.
         example.x;
 
-        // Ignored, since the this value is not an Example object and [LenientThis] is used.
+        // Ignored, since the this value is not an Example object and [LegacyLenientThis] is used.
         Object.getOwnPropertyDescriptor(Example.prototype, "x").get.call(obj);
 
-        // Also ignored, since Example.prototype is not an Example object and [LenientThis] is used.
+        // Also ignored, since Example.prototype is not an Example object and [LegacyLenientThis] is used.
         Example.prototype.x;
 
         // Throws a TypeError, since Example.prototype is not an Example object.
@@ -11740,13 +11740,13 @@ in which case they are exposed on every object that [=implements=] the interface
                     <emu-val>null</emu-val> or <emu-val>undefined</emu-val>, or |realm|'s
                     [=Realm/global object=] otherwise.
                     (This will subsequently cause a {{ECMAScript/TypeError}} in a few steps, if
-                    the global object does not implement |target| and [{{LenientThis}}] is not
+                    the global object does not implement |target| and [{{LegacyLenientThis}}] is not
                     specified.)
                     <!-- https://www.w3.org/Bugs/Public/show_bug.cgi?id=18547#c9 -->
                 1.  If |esValue| [=is a platform object=], then [=perform a security check=],
                     passing |esValue|, |attribute|'s [=identifier=], and "getter".
                 1.  If |esValue| does not [=implement=] |target|, then:
-                    1.  If |attribute| was specified with the [{{LenientThis}}]
+                    1.  If |attribute| was specified with the [{{LegacyLenientThis}}]
                         [=extended attribute=], then return <emu-val>undefined</emu-val>.
                     1.  Otherwise, [=ECMAScript/throw=] a {{ECMAScript/TypeError}}.
                 1.  If |attribute|'s type is an [=observable array type=], then return |esValue|'s
@@ -11793,13 +11793,13 @@ in which case they are exposed on every object that [=implements=] the interface
                 <emu-val>null</emu-val> or <emu-val>undefined</emu-val>, or |realm|'s
                 [=Realm/global object=] otherwise.
                 (This will subsequently cause a {{ECMAScript/TypeError}} in a few steps, if
-                the global object does not implement |target| and [{{LenientThis}}] is not
+                the global object does not implement |target| and [{{LegacyLenientThis}}] is not
                 specified.)
                 <!-- https://www.w3.org/Bugs/Public/show_bug.cgi?id=18547#c9 -->
             1.  If |esValue| [=is a platform object=], then [=perform a security check=], passing
                 |esValue|, |id|, and "setter".
             1.  Let |validThis| be true if |esValue| [=implements=] |target|, or false otherwise.
-            1.  If |validThis| is false and |attribute| was not specified with the [{{LenientThis}}]
+            1.  If |validThis| is false and |attribute| was not specified with the [{{LegacyLenientThis}}]
                 [=extended attribute=], then [=ECMAScript/throw=] a {{ECMAScript/TypeError}}.
             1.  If |attribute| is declared with the [{{Replaceable}}] extended attribute, then:
                 1.  Perform [=?=] <a abstract-op>CreateDataProperty</a>(|esValue|, |id|, |V|).
@@ -11935,7 +11935,7 @@ in which case they are exposed on every object that [=implements=] the interface
                     <emu-val>null</emu-val> or <emu-val>undefined</emu-val>, or |realm|'s
                     [=Realm/global object=] otherwise.
                     (This will subsequently cause a {{ECMAScript/TypeError}} in a few steps, if
-                    the global object does not implement |target| and [{{LenientThis}}] is not
+                    the global object does not implement |target| and [{{LegacyLenientThis}}] is not
                     specified.)
                     <!-- https://www.w3.org/Bugs/Public/show_bug.cgi?id=18547#c9 -->
                 1.  If |esValue| [=is a platform object=], then [=perform a security check=],