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This PR fixes the problem where Flutter would not respect the "remove animation" accessibility setting on Android 12+. Please see this issue for details: https://github.com/flutter/flutter/issues/130976 As [mentioned](https://github.com/flutter/flutter/issues/130976#issuecomment-1931388665) by [horsemankukka](https://github.com/horsemankukka), the problem has to do with reading `Settings.Global.TRANSITION_ANIMATION_SCALE` as a string instead of a float. Flutter would compare it to the string "0" to determine if animations should be disabled. Presumably, this worked because the settings app did indeed use the string "0" or "1" for this setting. But as of Android 12 it's instead written using float representation ("0.0" or "1.0"), at least on Samsung devices. [The documentation](https://developer.android.com/reference/android/provider/Settings.Global#TRANSITION_ANIMATION_SCALE) also states that this setting should be read as a float, which is what this PR does. [C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style