Nyall Dawson 2212617f0c Reuse a single expression context when building icons in QgsStyleModel
Whilst usually this is bad practice (reusing an existing expression context),
and instead you should make a new context for every batch of expression evaluations,
we can't do this in the style model and we end up potentially creating
thousands of new contexts. So instead, we use a single one, which is
safe because the actual expression context used here is a very
basic one...
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Dox
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