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Reland https://github.com/flutter/flutter/pull/141818 with a fix for a special case: If only `background` is specified for `TextButton.styleFrom` or `OutlinedButton.styleFrom` it applies the button's disabled state, i.e. as if the same value had been specified for disabledBackgroundColor. The change relative to #141818 is the indicated line below: ```dart final MaterialStateProperty<Color?>? backgroundColorProp = switch ((backgroundColor, disabledBackgroundColor)) { (null, null) => null, (_, null) => MaterialStatePropertyAll<Color?>(backgroundColor), // ADDED THIS LINE (_, _) => _TextButtonDefaultColor(backgroundColor, disabledBackgroundColor), }; ``` This backwards incompatibility cropped up in an internal test, see internal Google issue b/323399158.
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