Make \Drupal\views\Plugin\views\display\DisplayPluginBase::getType() public and add it to the interface.

Problem/Motivation

This is a bit of a cleanup task. When you are working with views plugins you sometimes need to see which type of display you are working in.

This is particularly useful when you need a different output format for "data" displays as opposed to "normal" displays.

I've been working on tooling for REST data displays and this is the 5th time i've needed to know if the current display was a "data" display.

I don't see a use case for having a protected getter that doesn't harbor sensitive data.

Proposed resolution

Make the getType method public and add it to the DisplayPluginInterface interface.

Remaining tasks

Create a patch and review.

User interface changes

none

API changes

DisplayPluginInterface will have to implement getType but fallbacks to DisplayPluginBase will already implement getType.

Data model changes

none

Beta phase evaluation