**Motivation**
Searching for categories is one of the main use cases for advanced search, and most people expect such a search to also find contents of subcategories of the searched category.
**Task**
Add the new deep category search keyword to the advanced param form, once it is implemented.
**Mock**
For position and label see
{F15403574}
**Info i text**
{F14627970}
TEXT FOR COPYING:
**Pages in this language:**
**Description:** Searches for pages that are in these categories and subcategories.
**Be aware of the following: **
- Only the first 5 subcategories will be considered in your search.
- The number of categories is limited to 256.
- You can look for pages in multiple categories.
**Help page:** [[ https://www.mediawiki.org/wiki/Help:CirrusSearch#Deepcategory | deepcategory ]]
**Syntax-Equivalent in the normal search:** `deepcategory:` followed by a category name like `deepcategory:Help`. Use double quotes if the name contains spaces: `deepcategory:"Hidden categories"`.
**Acceptance Criteria**
[] The label and field are in the position as indicated in the mock
[] Users can add multiple categories to the field
[] There is a dropdown that suggests which categories exist, but you can also write your own category name that is not in the dropdown
[] The tags of categories without a file page have red font
**Note** We can reuse the category multiselect widget from the Upload wizard
The existing categories should stay black (not blue like in screenshot) for advanced search.
suggester: {F15403526}
no suggester when category doesn't exist but typing is possible: {F15403530}
after tag creation text turns red: {F15403537}