Artifact while tab-browsing with auto-sidebar lua script

[ralf3u]

Steps to reproduce the issue

1. Create a TXT-document with a lot of text like lorem ipsum.
2. Create a HTML-document with some text like lorem ipsum within a div tag with this style: position:absolute;top:400px.
3. Tab-browse from the TXT-document to the HTML-document.

Result
In the Preview on the top of the webpage one can see for a part of a second the text of the TXT-document in bold.

Expectation
There should be no text of the TXT-document within the webpage.

Remark
I tested today both versions of auto-sidebar, the auto-sidebar on the webpage of the project and also the auto-sidebar of issue number 12. In both versions the artifact occurs.

Version
Preview 0.2.4+r4.gcf00e5b

[xiota]

Moved issue from lua-scripts because this is a bug in Preview.

[ralf3u]

It seems to be that there is only an issue with TXT-documents because if I use a MD-document or an other HTML-document, then I can't see an issue.

[ralf3u]

The issue occurs also when switching from a fountain-document to the HTML-document.