printer configuration:
ss -> sm : Just apply the color changes of the original ss project at the active extruder.
ss -> mm : There are no tool changes stored. Ignore color changes, they are invalid because they are extruder non-specific.
sm -> ss : Apply tool changes as color changes (tool changes remember the target color), apply original color changes.
sm -> mm : Ignore both color changes and tool changes.
mm -> ss/sm : Ignore both color changes and tool changes.
so that the ordering code at G-code export may work directly with
pointers to PrintInstances instead of with pair of <PrintObject, copy idx>.
Also the PrintInstance knows its source ModelInstance, which allows
sorting of PrintInstances for sequential printing in the order
they appear in Plater's object list.
psWipeTower now equals to new psToolOrdering indicating that
the ToolOrdering has been calculated (only if non-sequential mode is active).
psBrim now equals to new psExtrusionPaths
psExtrusionPaths shall be the last step before psWipeTower, indicating
that all the printing extrusions are calculated for the G-code preview
slider to edit the custom per print_z color changes, tool changes etc.
Refactoring of GCode export of color changes, extruder switches etc,
so that the "color change" like extruder switches are applied first
at the Wipe Tower / G-code export, so that adding / removing
an extruder switch at the G-code preview slider does not invalidate
slicing.
1) Don't allocate ExtruderOverrides if not necessary
2) Use boost::container::small_vector<int32, 3) for ExtruderOverrides
(usually less than 4 instances are printed))
In case there were empty object layers supposed to be floating on supports which were set to use a specific extruder, wipe tower was missing layer required to do the toolchange, leading to a crash
Such cases are now detected and layers that need it are additionally assigned as wipe tower layers
Also tracked as SPE-526
Added detection of empty layers so the wipe tower doesn't trip on them (it is not printable anyway).
This should improve wipe tower reliability with supports, objects standing on edges, etc.
I also turned an assert into exception throw to prevent hard crashes and nonsense output.
There was a bug in unit tests that led to generating the wipe tower with non-normalized preset.
This caused out-of-bounds access into max_layer_height vector in fill_wipe_tower_partitions.
The problem surfaced in https://github.com/prusa3d/PrusaSlicer/issues/2288.
I quickly patched additional normalization of the preset to prevent this from happening.
Also, an assert in the same function turned out to trip on one of the tests.
This one was commented out for now and will (hopefully) be looked into later.
Function Print::apply_config was renamed to apply_config_perl_tests_only so everyone
sees its current purpose and does not mistake it for the more important Print::apply.
by PrintObject::region_volumes. This is due to the way Print::apply()
works, it does not invalidate an existing PrintObject if a new region
is added to the print.
