Nyall Dawson 769c68b591 [api][expressions] Allow additional map layer stores to be associated
with an expression context

This allows the various expression functions which can refer to
layers to also locate layers stored in these additional,
non-QgsProject::instance, store.

The immediate use case is paving the way for expressions to access
temporary layers created during the execution of processing jobs
(ie model steps). (This is just an API building block toward that
goal)
2022-12-16 03:37:26 +10:00
..
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