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, 3 insertions, 1 deletions

diff --git a/source/blender/makesrna/intern/rna_action.c b/source/blender/makesrna/intern/rna_action.c
index 424e2004749..b8a490ea904 100644
--- a/source/blender/makesrna/intern/rna_action.c
+++ b/source/blender/makesrna/intern/rna_action.c
@@ -650,13 +650,14 @@ static void rna_def_action_pose_markers(BlenderRNA *brna, PropertyRNA *cprop)
 	
 	prop = RNA_def_property(srna, "active", PROP_POINTER, PROP_NONE);
 	RNA_def_property_struct_type(prop, "TimelineMarker");
-	RNA_def_property_flag(prop, PROP_EDITABLE);
+	RNA_def_property_flag(prop, PROP_EDITABLE | PROP_LIB_EXCEPTION);
 	RNA_def_property_pointer_funcs(prop, "rna_Action_active_pose_marker_get",
 	                               "rna_Action_active_pose_marker_set", NULL, NULL);
 	RNA_def_property_ui_text(prop, "Active Pose Marker", "Active pose marker for this action");
 	
 	prop = RNA_def_property(srna, "active_index", PROP_INT, PROP_UNSIGNED);
 	RNA_def_property_int_sdna(prop, NULL, "active_marker");
+	RNA_def_property_flag(prop, PROP_LIB_EXCEPTION);
 	RNA_def_property_int_funcs(prop, "rna_Action_active_pose_marker_index_get",
 	                           "rna_Action_active_pose_marker_index_set", "rna_Action_active_pose_marker_index_range");
 	RNA_def_property_ui_text(prop, "Active Pose Marker Index", "Index of active pose marker");
@@ -688,6 +689,7 @@ static void rna_def_action(BlenderRNA *brna)
 	prop = RNA_def_property(srna, "pose_markers", PROP_COLLECTION, PROP_NONE);
 	RNA_def_property_collection_sdna(prop, NULL, "markers", NULL);
 	RNA_def_property_struct_type(prop, "TimelineMarker");
+	RNA_def_property_flag(prop, PROP_LIB_EXCEPTION); /* T45689 - so that the list isn't greyed out; adding/removing is still banned though */
 	RNA_def_property_ui_text(prop, "Pose Markers", "Markers specific to this action, for labeling poses");
 	rna_def_action_pose_markers(brna, prop);