Replace shouldExcludeGesturesOnFocusGained callaback by a boolean

[julien4215]

The goal is to simplify the code by replacing a callback by a boolean in the AndroidGesturesExclusionWidget.

This was part of the PR #1921. I only took this change for now because I am not sure about the rest.

[veloce]

Please provide a description in your PR. What are you trying to solve? How? Anything that can help me understand. I don't want to figure things out just by reading the code. Thanks.

[julien4215]

I have added a description to the PR.

[veloce]

Code looks good. Have you tested it to be sure it still works as expected?

[julien4215]

I have tested it. The behavior is the same as before so I think it can be merged.

However it made me realize that the gesture exclusion is broken on the game screen. The gesture exclusion happens below the board.

[veloce]

How so? I may be, but I don't understand why since this code hasn't changed.

[julien4215]

I don't know. It works correctly on the puzzle board (well only on half of the board because of the 200 dp limit on setAndroidBoardGesturesExclusion) but it doesn't work at all for the game screen.