Disable overscroll effect on Android when reduce animations setting is enabled

[hjiangsu]

Pull Request Description

This PR disables overscroll effects on Android whenever the reduce animation setting is on. Previously, we used to set the physics for scrollable lists to use BouncingScrollPhysics to match what happens on iOS. However, as mentioned in #758, that was not an optimal solution to this issue.

As such, I've figured out an alternate method of completely disabling overscroll effects by overriding the default scrollBehaviour when the app initializes.

Note that I had to add in reduceAnimations to ThemeState as main.dart does not have access to ThunderBloc. This does duplicate the code a bit since this setting is also present in ThunderState. To clean this up, we can remove reduceAnimations in ThunderState and only use the value present in ThemeState (I'll leave this as a TODO for the future PR)

@micahmo I've tested this on an emulator, but do try it out on a physical device and see if it works appropriately!

Issue Being Fixed

Issue Number: #758

Screenshots / Recordings

overscroll.webm

Checklist

• Did you update CHANGELOG.md?
• Did you use localized strings where applicable?
• Did you add semanticLabels where applicable for accessibility?

[micahmo]

Works perfect on a physical device!!

Note that I had to add in reduceAnimations to ThemeState as main.dart does not have access to ThunderBloc.

FWIW, @ggichure proposed moving ThunderBloc to main.dart in #832. If you go with that approach, that would solve this issue too.

[hjiangsu]

FWIW, @ggichure proposed moving ThunderBloc to main.dart in #832. If you go with that approach, that would solve this issue too.

That could also be a possibility!