Introduce message copy button on web
Summary:
The purpose of this button is to copy a message source, including the markdown. The solution uses a recommended approach https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/Interact_with_the_clipboard of interacting with the clipboard.
Linear task: https://linear.app/comm/issue/ENG-2332/copy-message-button-on-web
In this diff we're not giving any feedback to the user, especially we don't display a different tooltip when a message is successfully copied. https://www.figma.com/file/a1nkbWgbgjRlrOY9LVurTz/Comm-%2F-Desktop-app?node-id=1170%3A78271&t=LDQhPB76aimwoBhD-0 This will be handled later in the stack.
Depends on D6013
Test Plan:
- Check if the button is present only for text messages and sidebar sources based on text messages.
- Check if copying a text messages with non-markdown content results in clipboard being filled with its content.
- Check if the same happens when a message contains some markdown. Paste it and send to verify that a new message looks the same.
- The testing was performed on Chrome, Safari and in Electron.
Reviewers: kamil, inka, ginsu
Reviewed By: kamil, inka, ginsu
Subscribers: ashoat
Differential Revision: https://phab.comm.dev/D5852