scrollbar not adjusted with ED3

[jerch]

Repro:

• call ls -l to get some lines shown in the terminal
• write echo -e '\x1b[3J'

--> scrollbar get not adjusted, although there nothing to scroll over (does basically nothing)

Idk yet if there is just call to update the scrollbar is missing in ED3 directly, or if there something missing at a higher level (which would also affect other sequences adding or removing terminal lines).