Version: 2.6.1

Bug Description

Tracy\IBarPanel::getTab() returning non-string breaks Tracy silently in hard to debug way due to

1. declare(strict_types=1) in bar.phtml
2. bar.phtml uses trim() which requires string
3. bar.phtml is rendered in a way which suppresses all errors and does not catch TypeError.

There are actually two issues:

1. broken support for Nette\Utils\Html
2. failing in way which makes it hard to debug.

The second one being far more important.

Steps To Reproduce

Return Nette\Utils\Html from Tracy\IBarPanel::getTab()

Expected Behavior

Tracy bar should not silently stop working without any information from user.

Possible Solution