nimforum doesn't redirect on new thread or reply on vivaldi
# Versions
- Ubuntu 18.04
- Vivaldi | 2.5.1525.48 (Stable channel) (64-bit)
- Revision | 29398d382527041597792325909ec48e07e1f5a6
- JavaScript | V8 7.4.288.28

# Scenario
Create a new thread or reply to user

# Expected
redirect to the newly created object

# What happened

```javascript
forum.js?t=2018-07-2114%3A36%3A22:3227 Uncaught Error: Error: unhandled exception: same(kxi.currentTree, getElementById(document, kxi.rootId), 0)  [AssertionError]

    at unhandledException (forum.js?t=2018-07-2114%3A36%3A22:3227)
    at raiseException (forum.js?t=2018-07-2114%3A36%3A22:1544)
    at sys_fatal_17822 (forum.js?t=2018-07-2114%3A36%3A22:3241)
    at raise_assert_17817 (forum.js?t=2018-07-2114%3A36%3A22:3247)
    at dodraw_204447 (forum.js?t=2018-07-2114%3A36%3A22:3930)
    at HEX3Aanonymous_205401 (forum.js?t=2018-07-2114%3A36%3A22:3961)
```