[5.8] Fix Filesystem download non-ASCII fielname

[maliang]

Fixed #2703#2305

[sisve]

This looks like something that could use a unit test to make sure it continues working in the future too.

[taylorotwell]

I don't think this actually fixes anything? The basename of this file could still have UTF-8 characters? It's the end-users responsibility.

[4n70w4]

@maliang that s work for me:

Index: vendor/laravel/framework/src/Illuminate/Filesystem/FilesystemAdapter.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- vendor/laravel/framework/src/Illuminate/Filesystem/FilesystemAdapter.php	(date 1558007947471)
+++ vendor/laravel/framework/src/Illuminate/Filesystem/FilesystemAdapter.php	(date 1558007947471)
@@ -138,7 +138,7 @@
     {
         $response = new StreamedResponse;
 
-        $disposition = $response->headers->makeDisposition($disposition, $name ?? basename($path));
+        $disposition = $response->headers->makeDisposition($disposition, $name ?? basename($path), Str::ascii($name));
 
         $response->headers->replace($headers + [
             'Content-Type' => $this->mimeType($path),