Make usage of 'category depth' input field a bit clearer by greying out (until category is entered) and perhaps by integrating a counter about commonsextension

[wetneb]

I think the simplest and cleanest implementation of this would simply be to set the <input> field to have type="number", which then uses the browser's native widget to let users input numbers.

[trnstlntk]

I think we can safely encourage/nudge users to go to a maximum depth of 6-ish categories - deeper will make the retrieval of files very slow I think? But what if a user wants to indeed enter a higher number (eg 11)?

[lozanaross]

If we implement a counter, maybe the counter only goes up to 6 (I like the idea of starting from 0, but that is still in a greyed out box until the category is picked, then the background becomes white and the user can increase the count up or down (with 6 as max value).

By counter I imagine something like this: https://i.stack.imgur.com/QAzfp.gif
(gif source is this page: https://stackoverflow.com/a/63332217 - don't know if script is actually good, just like the looks of the UI)