Mark all "My" menu links as external

Custom menu links may use URLs that are not covered by the client
router. When following a link that shares the domain, it will be
intercepted by the catchall route and a visual 404 will be mistakenly
shown. With this change, all of the custom links in this menu are marked
as external so that following them causes a full reload and a 404 is
shown only in the appropriate case.

Change-Id: I1cad36de97786a0f9af42e08105ab485fa198a15

polygerrit-ui/app/elements/core/gr-main-header/gr-main-header.js

@@ -219,6 +219,12 @@
       // makes assumptions that work for the GWT UI, but not PolyGerrit,
       // so we'll just disable it altogether for now.
       delete linkObj.target;
+
+      // Becasue the "my menu" links may be arbitrary URLs, we don't know
+      // whether they correspond to any client routes. Mark all such links as
+      // external.
+      linkObj.external = true;
+
       return linkObj;
     },
 

polygerrit-ui/app/elements/core/gr-main-header/gr-main-header_test.html

@@ -58,9 +58,9 @@ limitations under the License.
         {url: 'https://awesometown.com/#hashyhash'},
         {url: 'url', target: '_blank'},
       ].map(element._fixMyMenuItem), [
-        {url: '/q/owner:self+is:draft'},
-        {url: 'https://awesometown.com/#hashyhash'},
-        {url: 'url'},
+        {url: '/q/owner:self+is:draft', external: true},
+        {url: 'https://awesometown.com/#hashyhash', external: true},
+        {url: 'url', external: true},
       ]);
     });