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Relates to https://github.com/flutter/flutter/pull/147098 and https://github.com/flutter/flutter/issues/147097 Aside from fixing the expland/collapse icon color in the other PR, I noticed the splash color on both the icon button and the full expansion panel (if ExpansionPanel.canTapOnHeader is set to true) is just `Theme.of(context).splashColor` on the `InkWell` and `Theme.of(context).highlightColor` on the `IconButton` which may not suit the color scheme of the `ExpansionPanel`, so I have added a custom field `splashColor`, which will effect both the `IconButton` and the full panel `Inkwell`.