feat: drag files between file panes (move or copy, SSH hosts too) and into a terminal of the same machine

internal/server/web/static/wsutil.test.js

@@ -33,3 +33,9 @@ test('fmtSize', () => {
   assert.strictEqual(U.fmtSize(10), '10 B');
   assert.strictEqual(U.fmtSize(2048), '2.0 K');
 });
+
+test('dropAction: other SSH user on the same host is another place', () => {
+  const a = {kind: 'ssh', id: 'm1|root@h:22', label: 'root@h'};
+  const b = {kind: 'ssh', id: 'm1|bob@h:22', label: 'bob@h'};
+  assert.strictEqual(U.dropAction({source: a, paths: ['/x'], dir: '/'}, {kind: 'term', source: b}).kind, 'deny');
+});