chatview: file preview remains visible when selecting a different conversation

Scenario

• Alice opens a conversation.
• She attaches a file to a message, but does not send it. She sees a preview in the chatview.
• She selects a different conversation.

Expected result

She should no longer see the preview.

Actual result

She can still see the preview.

added bug label

added critical label

removed critical label

added good-first-issue label

A Draft mechanism should be done for file transfer

added BacklogLow UI/UX labels

mentioned in commit cb829676

closed