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Grease Pencil modifier properties don't update in realtime when linked to a driver
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System Information
Operating system: win 64
Graphics card: gforce gtx 1060

Blender Version
Broken: 2.80, 936014ea8c74
Worked: former builds (tried with 2.80, a77b63c56943, 04.01.2019)

Short description of error
When assigning a driver to the value of a GP modifier setting, it doesn't update in real time

Exact steps for others to reproduce the error

  • add a modifier to a GP object and link one of its properties it to another object's transform channel
  • it will not update until forced by pressing update dependencies

I made this demonstration file and it works just fine in the newest build, but when I try to isolate the issue, at some point it breaks and I have to manually update in order to see the correct result.
( This is how it should look like )
also the dotted white lines in the driver editor will only change position in x-direction (might be a different issue though)

I used to be able to add tags to a bug report but not anymore?



Event Timeline

@Philipp Oeser (lichtwerk) I think we have already a bug open for this, no?

Edited: I think the related task is T57483

weird thing is, that it used to work flawlessly in earlier builds from this year. It even works with the current build if I load the demo file I linked until I delete some of the modifiers to single it out.

Brecht Van Lommel (brecht) triaged this task as Confirmed, Medium priority.

Marking as confirmed, can be merged into T57483 if it's the same bug.