Blender Git Loki

Merge branch 'master' into blender2.8

New API function to call an existing menu

Thanks Campbell Barton for the help and review.
This is for Blender 2.8, so we are not using this function yet.

Fix T52871: `BLI_polyfill_beautify_quad_rotate_calc_ex` was mistakenly considering the state as degenerated

BLI_polyfill2d_test: script to generate test data

Cleanup: redundant casts

Correct test ifdef in polyfill

BLI_polyfill2d_test: add test for T52834

Commented since it currently fails.

BLI_polyfill2d_test: Try flipped x/y axis

In T52834 this makes a difference.

Missing from last commit

Cleanup: use stubs for eigen gtest

Boolean Modifier: add debug options

Only show & use when running in debug mode.

Avoid bias when calculating quad split direction

Some error checks weren't being done in both directions
when calculating the best split direction for a quad.

Correct recent error in boolean quad split check

BMesh: use less involved check for edge rotation

Was using function for edge rotation which was doing unnecessary checks
Use the face normal and BLI_polyfill_beautify_quad_rotate_calc directly.

Polyfill Beautify: option to rotate out of degenerate state

Needed for 3D iterative edge-rotation to avoid flipping when projected
from different angles,
but could keep zero area faces in 2D polygons.

Fix error in recent boolean changes w/ quad split

Fix T52291: Boolean fails w/ co-linear edged ngons

This means boolean tessellation wont match viewport tessellation
however it's needed to avoid zero area triangles causing problems.

Math Lib: clamped rounding utility functions

BLI_utildefines: sync w/ 2.8

Revert "Fix T52871: `BLI_polyfill_beautify_quad_rotate_calc_ex` was mistakenly considering the state as degenerated"

This reverts commit a8f11f5422afa01608817755eea310e987f896be.

Result is no longer symmetrical, will investigate a different fix.