Handle Firefox 100 disappearing scrollbars in Cockpit update test

The Cockpit update test relies on scrolling the Cockpit left bar
to find the Software Updates page, but in Firefox 100, the scroll
bars disappear shortly after the last time you moved the mouse.
To deal with this, instead of looking for a scroll bar to scroll,
we'll click the search box in the left bar and hit 'up' to scroll
it to the bottom.

Signed-off-by: Adam Williamson <awilliam@redhat.com>

lib/cockpit.pm

@@ -37,9 +37,16 @@ sub start_cockpit {
 
 sub select_cockpit_update {
     # This method navigates to to the updates screen
-    assert_screen ["cockpit_software_updates", "cockpit_leftbar_scroll"], 120;
+    # From Firefox 100 on, we get 'adaptive scrollbars', which means
+    # the scrollbar is just invisible unless you moved the mouse
+    # recently. So we click in the search box and hit 'up' to scroll
+    # the sidebar to the bottom if necessary
+    assert_screen ["cockpit_software_updates", "cockpit_search"], 120;
     click_lastmatch;
-    assert_and_click "cockpit_software_updates" if (match_has_tag "cockpit_leftbar_scroll");
+    if (match_has_tag "cockpit_search") {
+        send_key "up";
+        assert_and_click "cockpit_software_updates";
+    }
     # wait for the updates to download
     assert_screen 'cockpit_updates_check', 300;
 }

needles/cockpit/cockpit_leftbar_scroll-20200530.json

@@ -1,15 +0,0 @@
-{
-    "area": [
-        {
-            "height": 55,
-            "type": "match",
-            "width": 43,
-            "xpos": 196,
-            "ypos": 711
-        }
-    ],
-    "properties": [],
-    "tags": [
-        "cockpit_leftbar_scroll"
-    ]
-}

needles/cockpit/cockpit_search-20220503.json

@@ -0,0 +1,15 @@
+{
+  "area": [
+    {
+      "height": 20,
+      "ypos": 210,
+      "width": 18,
+      "type": "match",
+      "xpos": 31
+    }
+  ],
+  "properties": [],
+  "tags": [
+    "cockpit_search"
+  ]
+}