Module development and code questions

I recently created a drupal module project and messed up the tags and branches on my first attempt to upload. I flagged the first release I had created as unsupported in order to hide it. I then created a new release (new branch, new tag and version number upgraded) that I want to show as supported. However when I install it  and check for udpates it shows as unsupported.

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Hello All

 Im building a custom form with 3 dropdowns, cars brand, model and version, i need to select this by model and version.

 For example:

 Brand: Toyota, then display the select Hilux, and Year 2020.

 I have made something like this but it just work on first dropdown the second one doesnt update on change:

This might not be fully related to Drupal... but... I'm using the Drupal VM vagrant environment to develop with Drupal. I use xdebug a lot and sometimes (very rarely) xdebug refuses to trigger when I add a breakpoint in code. So I'll keep refreshing the site page in the browser to trigger xdebug but nothing happens, however, if I then clear the Drupal site cache (using drush cr on the command line) then xdebug immediatly works as expected on the next page refresh.

Hi, I've created a new field "nickname" in user account settings. I want to use custom validation constraint (https://www.drupal.org/docs/8/api/entity-api/entity-validation-api/providing-a-custom-validation-constraint) to make this field unique but I don't know what hook to use to add the constraint. Do you have any idea or alternative? Thanks!

Hi all,

I have created a media source plugin by following this tutorial -> https://www.drupal.org/docs/8/core/modules/media/creating-a-custom-media...

However as I suspected it doesn't fully work with the media library module. The library shows uploaded media but it doesn't allow one to add new media.

Upon investigation is seems I may need to create the form by extending the class

I'm trying to set the title attribute of an image (multiple) field using hook node presave. I will ultimately be using the filename without the extension but for now I'd just like to get the title to set then I should be right to build that variable.