Fix aggregate function returns incorrect results (LTR backport) #59085
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When the aggregate uses variables, we need to ensure that the cache key correctly considers the current value of ALL those variables. Otherwise we'll return incorrect results when an expression is re-evaluated after changing the variable value for the context. Fixes use of aggregate function with @symbol_label in legends. Fixes qgis#58221 (cherry picked from commit 7b88103)
(cherry picked from commit f618993)
troopa81
approved these changes
Oct 16, 2024
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Manual backport of #59000