'context.scene' not updating correctly from prop update function #80431

Closed
opened 2020-09-03 15:35:20 +02:00 by Christopher Gearhart · 9 comments

System Information
Operating system:
Graphics card:

Blender Version
Broken: 2.8x (tested 2.80, 2.83), 2.90
Worked: Never

Short description of error

When the active scene is changed by a property updater from the 'Scene' panel context, the context.scene property of the operator's context is not updated correctly. Similar to #75352, though cannot be fixed with the resolution described there.

Exact steps for others to reproduce the error

  • Open the default startup file
  • Run the following script:
import bpy

# create panel
class SCENE_PT_test_case(bpy.types.Panel):
    bl_space_type  = "PROPERTIES"
    bl_region_type = "WINDOW"
    bl_label       = "TEST CASE"
    bl_idname      = "SCENE_PT_test_case"
    bl_context     = "scene"

    def draw(self, context):
        scn = context.scene
        self.layout.prop(scn, "test_prop")


# define property update function
def new_scn(self, context):
    scn = bpy.data.scenes.new("My Scene_" + str(context.scene.test_prop))
    scn.world = bpy.data.worlds.new("My World")
    context.window.scene = scn
    print(context.window.scene.name, context.scene.name)


# register
bpy.types.Scene.test_prop = bpy.props.IntProperty(
    default=1,
    update=new_scn,
)
bpy.utils.register_class(TEST_OT_make_scene)
bpy.utils.register_class(SCENE_PT_test_case)
  • Navigate to the 'Render' properties panel, and scroll down to the new tab titled "TEST CASE".
  • Change the test_prop integer to something different. This will trigger the new_scn update function, which creates a new scene and sets it to the active scene. If it worked correctly, the names printed to the console should match.
**System Information** Operating system: Graphics card: **Blender Version** Broken: 2.8x (tested 2.80, 2.83), 2.90 Worked: Never **Short description of error** When the active scene is changed by a property updater from the 'Scene' panel context, the `context.scene` property of the operator's context is not updated correctly. Similar to #75352, though cannot be fixed with the resolution described there. **Exact steps for others to reproduce the error** - Open the default startup file - Run the following script: ``` import bpy # create panel class SCENE_PT_test_case(bpy.types.Panel): bl_space_type = "PROPERTIES" bl_region_type = "WINDOW" bl_label = "TEST CASE" bl_idname = "SCENE_PT_test_case" bl_context = "scene" def draw(self, context): scn = context.scene self.layout.prop(scn, "test_prop") # define property update function def new_scn(self, context): scn = bpy.data.scenes.new("My Scene_" + str(context.scene.test_prop)) scn.world = bpy.data.worlds.new("My World") context.window.scene = scn print(context.window.scene.name, context.scene.name) # register bpy.types.Scene.test_prop = bpy.props.IntProperty( default=1, update=new_scn, ) bpy.utils.register_class(TEST_OT_make_scene) bpy.utils.register_class(SCENE_PT_test_case) ``` - Navigate to the 'Render' properties panel, and scroll down to the new tab titled "TEST CASE". - Change the `test_prop` integer to something different. This will trigger the `new_scn` update function, which creates a new scene and sets it to the active scene. If it worked correctly, the names printed to the console should match.

Added subscriber: @bblanimation

Added subscriber: @bblanimation

Added subscribers: @ideasman42, @iss

Added subscribers: @ideasman42, @iss

I can confirm, but I am not sure if this is bug. @ideasman42 Can you check this?

I can confirm, but I am not sure if this is bug. @ideasman42 Can you check this?
Member

Added subscriber: @lichtwerk

Added subscriber: @lichtwerk
Member

Changed status from 'Needs Triage' to: 'Confirmed'

Changed status from 'Needs Triage' to: 'Confirmed'
Member

In #80431#1012106, @iss wrote:
I can confirm, ...

Please do so :)

> In #80431#1012106, @iss wrote: > I can confirm, ... Please do so :)

Changed status from 'Confirmed' to: 'Archived'

Changed status from 'Confirmed' to: 'Archived'
Campbell Barton self-assigned this 2020-09-15 09:14:41 +02:00

Checking on this, it would require a refresh/redraw of the UI immediately after setting the active scene, so the properties-editor updates the Scene path.

Closing this since depending on the context isn't likely to work well, the user may - for example pin the scene in the properties editor, so even if it was made to update in some cases, it wouldn't work reliably.

Note that, setting the scene from a properties update callback seems quite error prone too.

Checking on this, it would require a refresh/redraw of the UI immediately after setting the active scene, so the properties-editor updates the Scene path. Closing this since depending on the context isn't likely to work well, the user may - for example pin the scene in the properties editor, so even if it was made to update in some cases, it wouldn't work reliably. Note that, setting the scene from a properties update callback seems quite error prone too.

Added subscriber: @pauanyu_blender

Added subscriber: @pauanyu_blender
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Reference: blender/blender#80431
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