Fix pull request cross references

Closes #7974.

modules/references/references.go

@@ -460,7 +460,8 @@ func findAllIssueReferencesBytes(content []byte, links []string) []*rawReference
 			}
 			parts := strings.Split(u.EscapedPath(), "/")
 			// /user/repo/issues/3
-			if len(parts) != 5 || parts[0] != "" {
+			// /user/repo/pulls/7/files/...
+			if len(parts) < 5 || parts[0] != "" {
 				continue
 			}
 			var sep string

modules/references/references_test.go

@@ -132,6 +132,30 @@ func TestFindAllIssueReferences(t *testing.T) {
 				{203, "user4", "repo5", "203", true, XRefActionNone, nil, nil, ""},
 			},
 		},
+		{
+			"This http://gitea.com:3000/user4/repo5/pulls/202#x yes.",
+			[]testResult{
+				{202, "user4", "repo5", "202", true, XRefActionNone, nil, nil, ""},
+			},
+		},
+		{
+			"This http://gitea.com:3000/user4/repo5/pulls/202/commits yes.",
+			[]testResult{
+				{202, "user4", "repo5", "202", true, XRefActionNone, nil, nil, ""},
+			},
+		},
+		{
+			"This http://gitea.com:3000/user4/repo5/pulls/202/files yes.",
+			[]testResult{
+				{202, "user4", "repo5", "202", true, XRefActionNone, nil, nil, ""},
+			},
+		},
+		{
+			"This http://gitea.com:3000/user4/repo5/pulls/202/files#diff- yes.",
+			[]testResult{
+				{202, "user4", "repo5", "202", true, XRefActionNone, nil, nil, ""},
+			},
+		},
 		{
 			"This http://GiTeA.COM:3000/user4/repo6/pulls/205 yes.",
 			[]testResult{