Blender Git Loki

cleanup dynamic enum template script and adding a new one for a simple custom icon

Make it clearer that the dictionary stores collections of previews

Fix crash when trying to use new preview system from py in addon's registration at startup.

Now call UI_init() before py stuff!

Merge branch 'master' into ui-preview-buttons

Preview API: be more strict with new/load

Don't silently reuse existing id's, instead make dev use typical dictionary API calls if they're not sure the item
already exists.

Also add reload method.

Was clearing wrong previews

Tweak to new and load methods

setdefault would still evaluate the fallback argument,
now avoid calling the real new/load, when the we already have the value loaded

Rename utility to class to be clearly a private member

Also name internal data structure ImagePreview (incase we want other kinds of previews later)

Use a resource warning

remove redundant int

bpy.utils.previews api tweaks

- make BPyPreviewsCollection's annonymous
- unique id is generated automaticly
- caller store the previews in a named/meaningful location

Change resource management, previews now match file-io closer

Callers need to hold a reference to the preview collection and close when they're done

Comments

use easily identifiable separator for keys components

Remove redundant del statements

Avoid app._previews access via self.__class__._app

Instead import _previews globally

Also don't load bpy.utils.previews at start (now requires explicit import)

Rename delete -> remove

Follows convention for RNA collections (ID data for eg new/remove)

Cleanup: minor edits

Cleanup: style/redundant casts

Use regular module for bpy.app._previews

Since this is a collection of API calls, theres no need to define a custom type.