Set fake width instead of actually resizing image

The image quality shouldn't be reduced, but it should be shown smaller in clients.

Also add compatibility hack for broken clients like Element iOS that require a thumbnail_url

import.py

@@ -85,7 +85,6 @@ class MatrixStickerInfo(TypedDict, total=False):
 
 def convert_image(data: bytes) -> (bytes, int, int):
     image: Image.Image = Image.open(BytesIO(data)).convert("RGBA")
-    image.thumbnail((256, 256), Image.ANTIALIAS)
     new_file = BytesIO()
     image.save(new_file, "png")
     w, h = image.size
@@ -100,6 +99,14 @@ async def reupload_document(client: TelegramClient, document: Document) -> Matri
     print(".", end="", flush=True)
     mxc = await upload(data, "image/png", f"{document.id}.png")
     print(".", flush=True)
+    if width > 256 or height > 256:
+        # Set the width and height to lower values so clients wouldn't show them as huge images
+        if width > height:
+            height = int(height / (width / 256))
+            width = 256
+        else:
+            width = int(width / (height / 256))
+            height = 256
     return {
         "body": "",
         "url": mxc,
@@ -108,6 +115,14 @@ async def reupload_document(client: TelegramClient, document: Document) -> Matri
             "h": height,
             "size": len(data),
             "mimetype": "image/png",
+
+            # Element iOS compatibility hack
+            "thumbnail_url": mxc,
+            "thumbnail_info": {
+                "w": width,
+                "h": height,
+                "size": len(data),
+            },
         },
     }