Grease Pencil: Multiframe editing doesn't update properly #101547

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System Information
Operating system: Windows-10-10.0.19043-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 1060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 516.59

Blender Version
Broken: version: 3.4.0 Alpha, branch: master, commit date: 2022-09-30 22:40, hash: 206dead860
Worked: (newest version of Blender that worked as expected)

Short description of error
When enabling Multiframe editing it doesn't reliably update the lines.
In this example I didn't originally select all keyframes. If I do so afterwards, the viewport doesn't update immediately but only after I navigate the viewport.

Note that the lines also briefly flickered in the onion skinning colors.
If the view is in Front Orthographic, the lines can also have difficulties drawing on top of the grid overlay.
That's another way of reproducing the flickering when updating the viewport.

Exact steps for others to reproduce the error

Add a grease pencil object
Make sure the Onion skinning overlay is off
Enable Auto Keying in the timeline and draw a new line each frame
Make sure all keyframes are deselected
Enable Multiframe editing in the header
Select all keyframes in the timeline
Navigate the viewport

Also try switching the current frame and see how the lines flicker.
#101547.blend
gp_bug1.mp4

**System Information** Operating system: Windows-10-10.0.19043-SP0 64 Bits Graphics card: NVIDIA GeForce GTX 1060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 516.59 **Blender Version** Broken: version: 3.4.0 Alpha, branch: master, commit date: 2022-09-30 22:40, hash: `206dead860` Worked: (newest version of Blender that worked as expected) **Short description of error** When enabling Multiframe editing it doesn't reliably update the lines. In this example I didn't originally select all keyframes. If I do so afterwards, the viewport doesn't update immediately but only after I navigate the viewport. Note that the lines also briefly flickered in the onion skinning colors. If the view is in Front Orthographic, the lines can also have difficulties drawing on top of the grid overlay. That's another way of reproducing the flickering when updating the viewport. **Exact steps for others to reproduce the error** - Add a grease pencil object - Make sure the Onion skinning overlay is off - Enable Auto Keying in the timeline and draw a new line each frame - Make sure all keyframes are deselected - Enable Multiframe editing in the header - Select all keyframes in the timeline - Navigate the viewport Also try switching the current frame and see how the lines flicker. [#101547.blend](https://archive.blender.org/developer/F13608270/T101547.blend) [gp_bug1.mp4](https://archive.blender.org/developer/F13605910/gp_bug1.mp4)

Added subscriber: @JulienKaspar

Added subscriber: @antoniov

Could you test if this only happens when you use Select All or Unselect All? I mean, if you select the keyframes with the mouse in dopesheet works?

Could you test if this only happens when you use `Select All` or Unselect All? I mean, if you select the keyframes with the mouse in dopesheet works?

Added subscriber: @amelief

@amelief dout think this can be a missing update?

In #101547#1426620, @antoniov wrote:
Could you test if this only happens when you use Select All or Unselect All? I mean, if you select the keyframes with the mouse in dopesheet works?

Select all or deselect all doesn't update the Multiframe drawing when I do it in the dopesheet, but it does when I do it in the viewport.
And yes, if I select keyframes with the mouse in the dopesheet it does properly update the viewport.

> In #101547#1426620, @antoniov wrote: > Could you test if this only happens when you use `Select All` or Unselect All? I mean, if you select the keyframes with the mouse in dopesheet works? Select all or deselect all doesn't update the Multiframe drawing when I do it in the dopesheet, but it does when I do it in the viewport. And yes, if I select keyframes with the mouse in the dopesheet it does properly update the viewport.

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

Added subscriber: @PratikPB2123

Yes, I think there's a missing update in some of the selection operators. Hopefully, it should not be hard to fix.
Quickly going through each of them, it seems to be working for click-based selection and unselection, but not for select all/box/circle/lasso.

Yes, I think there's a missing update in some of the selection operators. Hopefully, it should not be hard to fix. Quickly going through each of them, it seems to be working for click-based selection and unselection, but not for select all/box/circle/lasso.

This issue was referenced by 567e3f6508

This issue was referenced by 567e3f650836ef060912c540013eb8fa0f447fe6

This issue was referenced by f7a781d45f

This issue was referenced by f7a781d45fcc79844c4d7fc8a17ede3d6cfc1eaf

Changed status from 'Confirmed' to: 'Resolved'

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Grease Pencil: Multiframe editing doesn't update properly #101547