0a1d550e5f
fixes https://github.com/flutter/flutter/issues/146414 --- I saw @abikko submitted a PR https://github.com/flutter/flutter/pull/146630, but it was not completed due to CLA and lack of test cases. I am willing to complete this PR in combination with @abikko's code (I don't know if this is allowed) This PR adds contorlAffinity to ListTileTheme so that [CheckboxListTile], [RadioListTile], [SwitchListTile], and [ExpansionTile] can read and use it For example: If ListTileTheme in Theme sets contorlAffinity, then [CheckboxListTile] can directly use contorlAffinity in ListTileTheme. Of course, if contorlAffinity is also set in [CheckboxListTile], the property in [CheckboxListTile] will be used first.