This was happening because the strip modifier types register
their panels when the editor is created, but the poll functions
of these panels did not check for the view type.
To fix this, add a condition to the `modifier_ui_poll`
that checks if the view type is not `SEQ_VIEW_PREVIEW`
when the panel is added to a sequencer space.
Pull Request: https://projects.blender.org/blender/blender/pulls/145964
This replaces the hardcoded function with modifier type callbacks
to make it easier to customize the reading/writing
for custom modifier data.
No functional changes.
Pull Request: https://projects.blender.org/blender/blender/pulls/145737
This PR updates the VSE strip modifiers interface.
It now uses the same design as the object modifiers.
Changes:
* Except for the "Mask Input" subpanel, the modifier UIs are unchanged.
* Modifiers can now be rearranged using drag & drop.
* Additionally, there is now an active strip modifier. This is exposed
though python via `strip.modifiers.active`.
This is in part for !139634 which needs the concept of an active modifier.
Notes:
* The `modifier.cc` file included all the implementation of all modifiers.
With the addition of a another new callback in this PR, this file was
getting quite big so I split everything out into individual files for all
modifiers. The modifiers are getting registered at launch.
* The modifier panels are getting added using a UI template
(`template_strip_modifiers`) very similar to the object modifiers.
Pull Request: https://projects.blender.org/blender/blender/pulls/145367
