Jim Graham bae2f9e7b8 [Impeller] Fix crash trying to check for duplicate vertices in shadow_path code (#180920)
The new general convex path shadow code was checking for duplicate
vertices without actually checking if the vectors contained any
vertices. Thus, <vector>.back() was being called on empty vectors, which
is bad. This led to a crash in G3 as their code is being run with a
vector implementation that protects against this, but apparently we do
not have such a vector implementation in our local building and testing.

No tests because this covered by existing test cases and a new
FML_DCHECK, however I'm not sure if we have DCHECKs enabled in CI...?
2026-01-15 08:24:27 -08:00
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