Compatibility with jenkinsci/jenkins#7203 (#186)

Author: basil

src/test/java/hudson/plugins/throttleconcurrents/ThrottleQueueTaskDispatcherTest.java

@@ -50,7 +50,7 @@
  * @author [email protected]
  */
 public class ThrottleQueueTaskDispatcherTest {
-    private static final String buttonsXPath = "//button[@tabindex='0']";
+    private static final String buttonsXPath = "//button";
     private static final String configFormName = "config";
     private static final String configUrlSuffix = "configure";
     private static final String logUrlPrefix = "log/";
@@ -341,12 +341,15 @@ private HtmlPage submitForm(HtmlForm form) throws IOException {
                     )
                     .click();
 
-        } else {
+        } else if (Jenkins.getVersion().isOlderThan(new VersionNumber("2.376"))) {
             List<HtmlElement> elementsByAttribute = form.getElementsByAttribute("input", "type", "submit");
             if (elementsByAttribute.isEmpty()) {
                 fail("Failed to find an input with type submit on the page");
             }
             page = elementsByAttribute.get(0).click();
+        } else {
+            HtmlButton button = form.getButtonByName("Submit");
+            page = button.click();
         }
         return page;
     }