Issue Summary

This is reproducible on the desktop browser and on Android mobile. This mostly affects mobile users who would like to edit a certain line in an editor of a very long description. When they click to edit, the focus scrolls up to the very top of the editor, and they have to scroll back down again to where they want to edit. They may save it every now and then to make sure the edits are saved so this happens numerous times, affecting customer productivity. 

Steps to Reproduce

1. Create a new card
2. Add a description with 300 lines of text
3. Save the description
4. Scroll down to the end of the description
5. Click the last line to activate the edit mode
6. Do Step 5 in a browser and in the Trello mobile app

Expected Results

Edit mode will be enabled and the focus indicator will be active in the area where you clicked, even if you're in the bottom of the editor. 
Save button in desktop should be accessible. It is at the very bottom of the editor which makes it harder for cards with long descriptions. Suggestion to add a Save button at the top as well.

Actual Results

In desktop browser: It scrolls up to the top of the editor, but if you scroll down, the focus indicator is active on the last line of the editor. You'll still have to click to the area you want to edit. 

In Trello Android app: It scrolls up to the top of the editor but if you scroll down, the focus indicator is active on the exact area where you clicked

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available