Bug: resizing the tag edit dialog then expanding the related tags
section doesn't resize the dialog to fit the expanded related tags
section. Instead a scrollbar appears.
Fixes this by expanding the dialog's height when the related tags are
shown.
Fixes these issues with the detachable tag edit dialog:
* Moving the edit dialog then expanding the related tags causes the
related tags to overflow outside the dialog.
* Expanding the related tags, moving the edit dialog, then collapsing
the tags causes the dialog to not resize back to its minimized size.
* Autocomplete the `search:<label>` metatag.
* Make label autocompletion do a prefix match instead of a substring
match. Example: `search:ar` matches `artists`, not `characters`. This
is how tags and most other things are autocompleted.
* Adds a "Tags" field to the post replacement dialog box. The given tags
are added to the post after replacement.
* Prefills the Tags field with certain tags that usually need to be
removed after replacement: replaceme, image_sample, jpeg_artifacts, etc.
Bug: in edit mode, each time you click a thumbnail the height of the tag
edit box increases by 4px.
This is due to `scrollHeight` including vertical padding. Fix it to a)
ignore this padding, and b) ensure the min height is at least 80px.
* Fix routing error in respond_with (didn't use /moderator namespace).
* Fix /moderator/posts/approvals.json response to return full
PostApproval object, not just a success/failure message.
* Simplify the javascript a bit (use $.post instead of $.ajax).
`Danbooru.Post.approve` is used for approving posts via the mode menu.
It doesn't hide all the notices or the approve/disapprove/flag buttons.
Click the link instead to hide those things.
Click the #quick-mod-approve link instead of #approve because #approve
prompts for confirmation.
