fix downloads: TextDecoder is not the same as String.fromCharCode.

despite what you might read elsewhere.
It would be easier if the crypto functions just handled Uint8Arrays directly...

html5/js/Client.js

@@ -1556,10 +1556,12 @@ class XpraClient {
       system_tray: true,
       //we cannot handle this (GTK only):
       named_cursors: false,
-      // printing
-      "file-transfer": this.file_transfer,
-      printing: this.printing,
-      "file-size-limit": 4 * 1024,
+      // file-transfer and printing:
+      "file": {
+        "enabled": true,
+        "printing": this.printing,
+        "size-limit": 32 * 1024 * 1024,
+      },
     });
   }
 
@@ -4840,9 +4842,8 @@ class XpraClient {
     if (data.length == filesize) {
       //got the whole file
       if (digest) {
-        digest.update(Utilities.Uint8ToString(data));
+        digest.update(Utilities.ArrayBufferToString(data));
         this.log("digest.update(", data, ")");
-        this.log("digest update string:", Utilities.Uint8ToString(data));
         if (!this.verify_digest(digest, options[digest.algorithm])) {
           return;
         }

html5/js/Utilities.js

@@ -457,7 +457,7 @@ const Utilities = {
      return StringToUint8(v.toString());
   },
 
-  ArrayBufferToBase64(uintArray) {
+  ArrayBufferToString(uintArray) {
     // apply in chunks of 10400 to avoid call stack overflow
     // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/apply
     let s = "";
@@ -485,7 +485,11 @@ const Utilities = {
         );
       }
     }
-    return window.btoa(s);
+    return s;
+  },
+
+  ArrayBufferToBase64(uintArray) {
+    return window.btoa(Utilities.ArrayBufferToString(uintArray));
   },
 
   ToBase64(v) {