Add workaround for views activity related fields.

[puresyntax71]

Overview

Activity status and type filters throw the following errors:

Error: Attempt to assign property "type" on null in Drupal\views\ManyToOneHelper->ensureMyTable() (line 251 of ./web/core/modules/views/src/ManyToOneHelper.php).

This happens when creating a view like this:

Create View listing Activities
Add "Activity Status" filter
Choose "is none of" or "is all of" operation.
Save View, now error.

Before

Throws an error.

After

The whole filter plugin is overridden from "list_field" to "in_operator" as a workaround to avoid the error.

Technical Details

Existing views that use the filters for activity status and type might need to reconfigure their views. The other difference is that "list_field" has the following operators:

• Is one of
• Is all of
• Is none of

The in_operator is somewhat simpler where in the operators are only the following:

• Is one of
• Is not one of