[material_ui] ButtonThemeData == and hashCode ignore layoutBehavior

Steps to reproduce

const a = ButtonThemeData();
const b = ButtonThemeData(layoutBehavior: ButtonBarLayoutBehavior.constrained);
print(a == b);

Expected results

false, since the two themes have different layoutBehavior values.

Actual results

true. ButtonThemeData.==, hashCode and debugFillProperties don't include layoutBehavior. Because ButtonTheme.updateShouldNotify compares data, changing only layoutBehavior also doesn't notify widgets that depend on the theme.

Seen in packages/material_ui/lib/src/button_theme.dart on main of flutter/packages (material_ui 1.9.0).

@ChandraChaan

@ChandraChaan Thanks for the report. I was able to reproduce this issue locally. Routing to team-design for further investigation.

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[material_ui] ButtonThemeData == and hashCode ignore layoutBehavior #195754

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[material_ui] ButtonThemeData == and hashCode ignore layoutBehavior #195754

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suryaKommana2662 commented on Nov 2, 2026

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