fix: set invalid link fields to `undefined` instead `''`

feat: keyboard shortcuts for the grid

This breaks other code where undefined values are removed, technically
invalid value for link field => unset link field so it should be
undefined

fix(performance): list view bulk operations

fix: reload doctype state early to fix patch

- Keep checkbox checked after Refresh

fix(ux): always show scan barcode button

fix: Text Editor Height

fix: Show unique records in list view

fix(Translations): Timeline added/removed rows fieldname (copy #15301)

fix: select perm not visible in role permission summary dialog

(cherry picked from commit 98721ddb2f)

threshold is used for limiting diff, target is more appropriate here.

feat: Document States

- disable realtime list update when bulk action is being executed
- clear checked items after bulk action is completed

fix: import doc / fixtures

since docs are moved to wiki

- use custom class for styling
- to avoid style leak in fieldnames which are "color"

- To accept argument via both way in a single request

- Rename lightblue -> light-blue

* fix: error code for not found

* fix: updating test

* fix: update status code

* fix: update test for status code 400