fix(material/expansion): center indicator icon in M3 #28603
Merged
+47
−12
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Currently the expansion panel arrow is drawn with borders which makes it difficult to center. It's also problematic in high contrast mode where it renders as a rectangle. We've wanted to fix this for a while, but it breaks a lot of internal screenshot tests (see #10503).
These changes resolve the issue for apps using M3 by having two indicators that we toggle using tokens.
Fixes #28037.