Text editor does not remember position of scrollbar

[HUSSAR-mtrela]

Text editor does not remember position of scrollbar when switching between topics

Steps:

1. load 2 .adoc files in the app
2. scroll to half of content in 1st topic
3. switch to 2nd topic
4. scroll to end of content in 2nd topic
5. switch to 1st topic
6. notice that scrollbar position is at the start of topic content instead of half of content