When a block type is set to hidden (inactive) on the plugins page then:
1) The instances of the block type should not show when viewing / editing a page
2) The instances of the block type do show when viewing the page in timeline (versioning mode) as we are unable to know when the block type was made inactive.
The patch handles the following scenarios
When a block type is set to hidden (inactive) on the plugins page then:
1) The instances of the block type should not show when viewing / editing a page
2) The instances of the block type do show when viewing the page in timeline (versioning mode) as we are unable to know when the block type was made inactive.