Put updated sizes in the upload when resizing

Closes #823

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/web/upload/filter/resize.ex

@@ -6,22 +6,27 @@ defmodule Mobilizon.Web.Upload.Filter.Resize do
   """
 
   @behaviour Mobilizon.Web.Upload.Filter
+  alias Mobilizon.Web.Upload
 
   @maximum_width 1_920
   @maximum_height 1_080
 
-  def filter(%Mobilizon.Web.Upload{
+  def filter(
+        %Upload{
           tempfile: file,
           content_type: "image" <> _,
           width: width,
           height: height
-      }) do
+        } = upload
+      ) do
+    {new_width, new_height} = sizes = limit_sizes({width, height})
+
     file
     |> Mogrify.open()
-    |> Mogrify.resize(string(limit_sizes({width, height})))
+    |> Mogrify.resize(string(sizes))
     |> Mogrify.save(in_place: true)
 
-    {:ok, :filtered}
+    {:ok, :filtered, %Upload{upload | width: new_width, height: new_height}}
   end
 
   def filter(_), do: {:ok, :noop}