desktop_update_graphical: explicitly check refresh on GNOME

OK, this is annoying. GNOME Software intentionally does *not*
clear the 'download' or 'reboot and update' button when you hit
the refresh button, it just leaves them sitting there while the
refresh happens. So let's specifically require the 'refreshing'
text to appear and go away before we try and click on download
or apply.

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

needles/gnome/desktop_package_tool_update_refreshing-f34-20220318.json

@@ -0,0 +1,16 @@
+{
+  "area": [
+    {
+      "type": "match",
+      "ypos": 41,
+      "width": 30,
+      "height": 28,
+      "xpos": 10
+    }
+  ],
+  "properties": [],
+  "tags": [
+    "DESKTOP-gnome",
+    "desktop_package_tool_update_refreshing"
+  ]
+}

needles/gnome/desktop_package_tool_update_refreshing-f35-20220318.json

@@ -0,0 +1,16 @@
+{
+  "area": [
+    {
+      "type": "match",
+      "height": 27,
+      "width": 30,
+      "ypos": 42,
+      "xpos": 10
+    }
+  ],
+  "properties": [],
+  "tags": [
+    "DESKTOP-gnome",
+    "desktop_package_tool_update_refreshing"
+  ]
+}

needles/gnome/desktop_package_tool_update_refreshing-f36-20220318.json

@@ -0,0 +1,16 @@
+{
+  "area": [
+    {
+      "xpos": 9,
+      "height": 27,
+      "width": 30,
+      "ypos": 42,
+      "type": "match"
+    }
+  ],
+  "properties": [],
+  "tags": [
+    "DESKTOP-gnome",
+    "desktop_package_tool_update_refreshing"
+  ]
+}

tests/desktop_update_graphical.pm

@@ -59,8 +59,26 @@ sub run {
     wait_still_screen 5, 90;
     # we always want to refresh to make sure we get the prepared update
     assert_and_click 'desktop_package_tool_update_refresh', timeout=>120;
-    # wait a while to make sure the UI clears to a 'refreshing' state
-    sleep 20;
+    # for GNOME, the apply/download buttons remain visible for a long
+    # time, annoyingly. So let's actually watch the 'refreshing' state
+    # till it goes away
+    if ($desktop eq 'gnome') {
+        assert_screen 'desktop_package_tool_update_refreshing';
+        # now wait for it to go away
+        for my $n (1..30) {
+            last unless (check_screen 'desktop_package_tool_update_refreshing', 6);
+            # if we matched, we likely matched *immediately*, so sleep
+            # the other five seconds
+            sleep 5;
+        }
+        sleep 3;
+    }
+    else {
+        # just wait a bit to make sure the UI clears to a 'refreshing'
+        # state
+        sleep 5;
+    }
+
     my $tags = ['desktop_package_tool_update_download', 'desktop_package_tool_update_apply'];
     # Apply updates, moving the mouse every two minutes to avoid the
     # idle screen blank kicking in. Depending on whether this is KDE