common code from all activities to one BaseActivity
improvement
Lint
beginnings of support for barrel-shaped objects.
Enforce AGP 8.1.4 (with AGP 8.2.2 the release build mysteriously crashes out with VerifyError!)
Change color scheme in Penrose cubes - icons.
Change color scheme in Penrose cubes.
minor
Important bugfix for the shape of concave cubit walls!
New version of CU_242
New object JSONs with new color set.
minor.
Important fix for the way vectors normal to the surfaces of the faces of the cubits are computed.
Before this was buggy in case of concave faces (CoinTetrahedron, CoinHexahedron, O2) - direction of the normal vector was wrong.
If an object is re-stickered so that there are less colors on its faces than originally, block submitting records.
Objects can support or not changing colors of their stickers.
New TwistyObject API to only restore the stickers, and not the object positions.
Color unification complete: 24 standard colors.
Beginnings of color unification
Fix the detection of the solved state.
Restore the colors and sticker properties from Preferences.
Save the colors and sticker properties to Preferences.
two bugfixes for configurable stickers
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