Anim: move 'solo bone collection' operator to menu and add 'show all'

Move operators that act on the active bone collection to a 'specials'
context menu, just like other UILists.

The menu now contains:
- Solo the active bone collection (i.e. make it visible and hide others).
- Show all bone collections.

scripts/startup/bl_operators/anim.py

@@ -506,9 +506,9 @@ class ARMATURE_OT_sync_bone_color_to_selected(Operator):
         return {'FINISHED'}
 
 
-class ARMATURE_OT_bone_collection_solo_visibility(Operator):
+class ARMATURE_OT_collection_solo_visibility(Operator):
     """Hide all other bone collections and show the active one"""
-    bl_idname = "armature.bone_collection_solo_visibility"
+    bl_idname = "armature.collection_solo_visibility"
     bl_label = "Solo Visibility"
     bl_options = {'REGISTER', 'UNDO'}
 
@@ -520,9 +520,25 @@ class ARMATURE_OT_bone_collection_solo_visibility(Operator):
 
     def execute(self, context):
         arm = context.object.data
-        active_bcoll = arm.collections.active
         for bcoll in arm.collections:
-            bcoll.is_visible = bcoll == active_bcoll
+            bcoll.is_visible = bcoll.name == self.name
+        return {'FINISHED'}
+
+
+class ARMATURE_OT_collection_show_all(Operator):
+    """Show all bone collections"""
+    bl_idname = "armature.collection_show_all"
+    bl_label = "Show All"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    @classmethod
+    def poll(cls, context):
+        return context.object and context.object.type == 'ARMATURE' and context.object.data
+
+    def execute(self, context):
+        arm = context.object.data
+        for bcoll in arm.collections:
+            bcoll.is_visible = True
         return {'FINISHED'}
 
 
@@ -532,5 +548,6 @@ classes = (
     ClearUselessActions,
     UpdateAnimatedTransformConstraint,
     ARMATURE_OT_sync_bone_color_to_selected,
-    ARMATURE_OT_bone_collection_solo_visibility,
+    ARMATURE_OT_collection_solo_visibility,
+    ARMATURE_OT_collection_show_all,
 )

scripts/startup/bl_ui/properties_data_armature.py

@@ -135,8 +135,9 @@ class DATA_PT_bone_collections(ArmatureButtonsPanel, Panel):
             col.separator()
             col.operator("armature.collection_move", icon='TRIA_UP', text="").direction = 'UP'
             col.operator("armature.collection_move", icon='TRIA_DOWN', text="").direction = 'DOWN'
-            props = col.operator("armature.bone_collection_solo_visibility", text="", icon='SOLO_ON')
-            props.name = active_bcoll.name
+            col.separator()
+
+        col.menu("ARMATURE_MT_collection_context_menu", icon='DOWNARROW_HLT', text="")
 
         row = layout.row()
 
@@ -149,6 +150,20 @@ class DATA_PT_bone_collections(ArmatureButtonsPanel, Panel):
         sub.operator("armature.collection_deselect", text="Deselect")
 
 
+class ARMATURE_MT_collection_context_menu(Menu):
+    bl_label = "Bone Collection Specials"
+
+    def draw(self, context):
+        layout = self.layout
+
+        arm = context.armature
+        active_bcoll = arm.collections.active
+
+        props = layout.operator("armature.collection_solo_visibility")
+        props.name = active_bcoll.name if active_bcoll else ""
+        layout.operator("armature.collection_show_all")
+
+
 class DATA_PT_iksolver_itasc(ArmatureButtonsPanel, Panel):
     bl_label = "Inverse Kinematics"
     bl_options = {'DEFAULT_CLOSED'}
@@ -275,6 +290,7 @@ classes = (
     DATA_PT_skeleton,
     DATA_PT_bone_collections,
     DATA_UL_bone_collections,
+    ARMATURE_MT_collection_context_menu,
     DATA_PT_motion_paths,
     DATA_PT_motion_paths_display,
     DATA_PT_display,

scripts/startup/bl_ui/space_view3d.py

@@ -3989,8 +3989,12 @@ class VIEW3D_MT_bone_collections(Menu):
             layout.label(text="- select bones to operate on first -")
             return
 
+        layout.operator("armature.collection_show_all")
+        layout.separator()
+
         arm = context.object.data
         bone = context.active_bone
+
         found_editable_bcoll = False
         for bcoll in arm.collections:
             if not bcoll.is_editable: