the code more readable and to highlight where PrintObject::region_volumes
are actually set and consumed.
2) Replaced Slic3r::clamp() with std::clamp(). They differ in the order
of their parameters, thus hopefully no new bugs were introduced.
3) Some refactoring of MultiMaterialSegmentation for efficiency.
Thus the first_layer_height is no more object specific. That makes
a lot of sense due to the brim calculation being performed over
all layers at once and due to future merging of supports of
different objects at first layer.
2) Because now first_layer_height is print specific, the relative
first layer height derived from the object layer height was partially
disabled: First the relative first layer height is converted to
an absolute value when importing config, second the side text
was changed from "mm or %" to "mm". Still the UI allows entering %.
Both changes may be controversial, let's wait for user feedback.
to help with detecting "not changed" event when taking
Undo/Redo snapshot or synchronizing with the back-end.
Converted layer height profile and supports / seam painted areas
to the same timestamp controlled structure.
The two new config keys define a minimum vertical shell thickness.
The top shell thickness is calculated as a maximum of sum over
top_solid_layers * layer heights and top_solid_min_thickness,
the bottom shell thickness is calculated as a maximum of sum over
bottom_solid_layers * layer heights and bottom_solid_min_thickness.
The results of the formula above are shown at the Print parameter page
below the two new values to hint the user about the interaction
of the old versus new config values.
top_solid_min_thickness has no meaning if top_solid_layers is zero,
bottom_solid_min_thickness has no meaning if bottom_solid_layers is zero.
