This was reported for FCurve modifiers, but was also true (in theory) for other instanced panels (regular modifiers, spreadsheet filters, ...), these would not show pinning for other reasons (no caterories). So in the case of the Graph Editor the follwing happens: `graph_buttons_register` only registers `GRAPH_PT_modifiers`, the panel itself has no header (PANEL_TYPE_NO_HEADER), further panels for individual modifiers are added dynamically in `graph_panel_modifiers`. So when pinning a particular modifier, we would pin e.g. `GRAPH_PT_noise` (not `GRAPH_PT_modifiers`). ED_region_panels_layout_ex would only collect panels known to `graph_buttons_register` (so is not aware of the specific panels of modifiers). So while I think it should be possible to pin `GRAPH_PT_modifiers` on top of an individual modifier's panel this would result in all modifiers being shown in other categories [which would also be weird]. Panel header layout was also not correct (drawing the pin icon over the modifier delete icon). So to resolve this, just dont use pinning for these type of panels. part of T92293. Maniphest Tasks: T92293 Differential Revision: https://developer.blender.org/D12965
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