Resizing textarea in activity palette looks ugly

[kartikaysaxena]

For elaboration please have a look below

See how textarea on resizing falls out of div and also at the bottom it makes the other buttons go off the screen

My fix(How it should behave)
It should resize only in vertical direction like this

[Shruti-codes236]

Can I work on this issue if this isn't resolved yet?

[llaske]

The issue is the same for all activities.

[llaske]

Fixed in #1522