Fix T45689: Pose Libraries cannot be used when using lib-linked actions as poselibs

This commit makes some tweaks that make it at least possible to use lib-linked
actions as Pose Libraries. Specifically:
* The apply poses button is no longer greyed out

* It is possible to select different poses from the list of poses

* All pose library operators which edit the poses stored in the poselib
  now have improved poll callbacks which perform extra checks for lib-linked
  actions (which cannot be edited, as all those changes will be lost)


Caveats:
* Due to the way the UI list template works, it doesn't seem to be possible to
  make it not grey out the items in the list. (While the double-click to rename
  thing shouldn't be allowed, items should at least look like they can be clicked on)

* The difference between clickable vs not-clickable isn't too great, making it hard
  to tell that that while the Add/Remove/Sanitise toggles are not usable,
  the Apply Poses is actually functional. But, this is a more of a  UI-toolbox
  level issue

1 files changed, 0 insertions, 1 deletions

diff --git a/release/scripts/startup/bl_ui/properties_data_armature.py b/release/scripts/startup/bl_ui/properties_data_armature.py
index 84e06d4c7fc..3c9e2eb8f8b 100644
--- a/release/scripts/startup/bl_ui/properties_data_armature.py
+++ b/release/scripts/startup/bl_ui/properties_data_armature.py
@@ -186,7 +186,6 @@ class DATA_PT_pose_library(ArmatureButtonsPanel, Panel):
             # column of operators for active pose
             # - goes beside list
             col = row.column(align=True)
-            col.active = (poselib.library is None)
 
             # invoke should still be used for 'add', as it is needed to allow
             # add/replace options to be used properly