make the action buttons for rebaseline server stick to the top of the window as you scroll

gm/rebaseline_server/static/utils.js

Index: gm/rebaseline_server/static/utils.js
diff --git a/gm/rebaseline_server/static/utils.js b/gm/rebaseline_server/static/utils.js
new file mode 100644
index 0000000000000000000000000000000000000000..e846b90bd663963e243446d2a5d6c8cffdf55ed0
--- /dev/null
+++ b/gm/rebaseline_server/static/utils.js
@@ -0,0 +1,12 @@
+function make_results_header_sticky( ) {
+  element = $(".results-header-actions");
+  var pos = element.position();
+  $(window).scroll( function() {
+    var windowPos = $(window).scrollTop();
+    if (windowPos > pos.top) {
+      element.addClass("sticky");
+    } else {
+      element.removeClass("sticky");
+    }
+  });
+}