fix ie11 spinlock in write-only folders

copyparty/httpcli.py

@@ -6978,6 +6978,14 @@ class HttpCli(object):
             if "zip" in self.uparam or "tar" in self.uparam:
                 raise Pebkac(403)
 
+            zsl = j2a["files"] = []
+            if is_js:
+                j2a["ls0"] = cgv["ls0"] = {
+                    "dirs": zsl,
+                    "files": zsl,
+                    "taglist": zsl,
+                }
+
             html = self.j2s(tpl, **j2a)
             self.reply(html.encode("utf-8", "replace"))
             return True

copyparty/web/browser.js

@@ -7560,9 +7560,10 @@ var treectl = (function () {
 		qsr('#bbsw');
 		srvinf = ebi('srv_info').innerHTML.slice(6, -7);
 		if (ls0 === null) {
-			setck('js=y');
 			r.ls_cb = showfile.addlinks;
-			return r.reqls(get_evpath(), false, undefined, true);
+			return setck('js=y', function () {
+				r.reqls(get_evpath(), false, undefined, true);
+			});
 		}
 		ls0.unlist = unlist0;
 		ls0.u2ts = u2ts;

copyparty/web/util.js

@@ -1326,9 +1326,10 @@ function scfg_bind(obj, oname, cname, defval, cb) {
     return v;
 }
 
-function setck(v) {
+function setck(v, cb) {
     var xhr = new XHR();
     xhr.open('GET', SR + '/?setck=' + v, true);
+    xhr.onload = cb;
     xhr.send();
 }