Caused by 7d7e90ca68.
When accessing context members from the windowmanager context
(`C->wm.store` which is mainly used for UI related stuff) the above
commit broke behavior in `CTX_store_ptr_lookup` in that it changed and
would **always** return NULL if no type is passed in. The call to
`CTX_store_ptr_lookup` from `ctx_data_get` **always** passes in NULL
though.
Accessing other context members survived since they take a different
code path in `ctx_data_get` and dont use `CTX_store_ptr_lookup`.
Now also return the entry if a NULL type was passed as it was before.
Fixes T103370, T103405, T103417
Differential Revision: https://developer.blender.org/D16840
Duplicating context lists took a measurable amount of time when drawing
large node trees in the node editor. Instead of using a linked list of
entries, which results in many small allocations, use a vector. Also,
use std::string and StringRefNull instead of char buffers and pointers.
