[spaceship] add a check in app_version.setup_screenshots to also chec…

…k if there is an app_preview already uploaded (#14738)

* add a check in setup_screenshots to also check if there is an app_preview alredy uploaded

* improve commenting

spaceship/lib/spaceship/tunes/app_version.rb

@@ -767,14 +767,19 @@ def container_data_for_language_and_device(data_field, language, device)
       end
 
       def setup_screenshots
-        # Enable Scaling for all screen sizes that don't have at least one screenshot
+        # Enable Scaling for all screen sizes that don't have at least one screenshot or at least one trailer (app_preview)
         # We automatically disable scaling once we upload at least one screenshot
         language_details = raw_data_details.each do |current_language|
           language_details = (current_language["displayFamilies"] || {})["value"]
           (language_details || []).each do |device_language_details|
+            # Do not enable scaling if a screenshot already exists
             next if device_language_details["screenshots"].nil?
             next if device_language_details["screenshots"]["value"].count > 0
 
+            # Do not enable scaling if a trailer already exists
+            next if device_language_details["trailers"].nil?
+            next if device_language_details["trailers"]["value"].count > 0
+
             # The current row includes screenshots for all device types
             # so we need to enable scaling for both iOS and watchOS apps
             device_language_details["scaled"]["value"] = true if device_language_details["scaled"]