Follow-ups from Beta-Testing feedback

What does this MR do?

Multiple small fixes and improvements:

• Fix MD input errors in selection detection
• Only conceal MD input toolbar if input is empty (fixes not hitting the send button)
• Default MD input max height based on screen height
• Display subscribe button as subscribed if mail notifications are active
• Auto-focus input in Slot description editing modal

How confident are you it won't break things if deployed?

confident

Links to related issues

Markdown Input: https://foodsharing.de/?page=bezirk&bid=734&sub=forum&tid=224391 Rework forum thread page: https://foodsharing.de/?page=bezirk&bid=734&sub=forum&tid=226224 Display distance to Store: https://foodsharing.de/?page=bezirk&bid=734&sub=forum&tid=223406 Slot descriptions: https://foodsharing.de/?page=bezirk&bid=734&sub=forum&tid=216771

Checklist

• added a test, or explain why one is not needed/possible...
• no unrelated changes
• asked someone for a code review
• set a "for:" label to indicate who will be affected by this change
• added to the next milestone (see https://gitlab.com/foodsharing-dev/foodsharing/-/milestones, unless it has a "for:Dev" label)
• added an entry to CHANGELOG.md
• Once your MR has been merged, you are responsible to create a testing issue in the Beta Testing forum: https://foodsharing.de/?page=bezirk&bid=734&sub=forum. Please change the MRs label to "state:Beta testing".
  • Consider writing a detailed description in German.
  • Describe in a few sentences, what should be tested from a user perspective.
  • Also mention different settings (e.g. different browsers, roles, ...) how this change can be tested.
  • Be aware, that also non technical people should understand.