Fix diff file dropdown

The 'value' computed should be the actual path not the displayed path.

Bug: Issue 7730
Change-Id: Ia701966ca9733ce52b848e71a8d446e2d3695e22

polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_test.html

diff --git a/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_test.html b/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_test.html
index ca06b8d..acb1aa5 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_test.html
+++ b/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view_test.html
@@ -332,7 +332,8 @@
           patchNum: '10',
         };
         element._change = {_number: 42};
-        element._fileList = ['chell.go', 'glados.txt', 'wheatley.md'];
+        element._fileList = ['chell.go', 'glados.txt', 'wheatley.md',
+          '/COMMIT_MSG', '/MERGE_LIST'];
         element._path = 'glados.txt';
         const expectedFormattedFiles = [
           {
@@ -348,6 +349,16 @@
             mobileText: 'wheatley.md',
             value: 'wheatley.md',
           },
+          {
+            text: 'Commit message',
+            mobileText: 'Commit message',
+            value: '/COMMIT_MSG',
+          },
+          {
+            text: 'Merge list',
+            mobileText: 'Merge list',
+            value: '/MERGE_LIST',
+          },
         ];
 
         assert.deepEqual(element._formattedFiles, expectedFormattedFiles);