Blender Git Loki

GPencil: Basic block drawing in Dopesheet

Add a bar between keyframes to indicate that keyframe is still used. This is part of a change to make the rec button be used by gpencil.

Example:

Before:
{F9592704}

After:
{F9592702}

Reviewed By: #user_interface, #grease_pencil, pepeland, Severin

Maniphest Tasks: T85463

Differential Revision: https://developer.blender.org/D10179