Hide instances and tags

[marax27]

The story

As a user,
I want to hide individual instances or tags,
so that I don't see them anymore in the search results.

Acceptance criteria

General

• User can hide media (individual instances as well as tags).
• One instance/tag can be hidden at once.
• Hiding media by a user does not affect other users' search queries. Moreover, a user does not know what other users have hidden.

Hiding an instance

• In the gallery side bar, there is a "Hide" button.
• When the button is clicked, a snackbar/toast with a 'Media instance hidden' message will appear.

Hiding a tag

• In the tag's context menu there is a "Hide" option.
• When the option is clicked, a snackbar/toast with a 'Tag "tag name" hidden' message will appear.

User panel

• In the user panel, there is a "Hidden media" panel. It displays:
  • a table of hidden instances
  • a table of hidden tags
• Each instance and each tags has a "Revert" button.
• When the button clicked:
  • if the reverting operation succeeds, button's text turns to "Reverted", and the button is disabled
  • if not, a snackbar/toast appears with a 'Operation failed. Try again later.' message.

Additional notes