boost::process::spawn() sets SIGCHLD to SIGIGN for the child process, thus if a child PrusaSlicer spawns another
subprocess and the subrocess dies, the child PrusaSlicer will not receive information on end of subprocess
(posix waitpid() call will always fail).
https://jmmv.dev/2008/10/boostprocess-and-sigchld.html
The child instance of PrusaSlicer has to reset SIGCHLD to its default, so that posix waitpid() and similar continue to work.
Fixes#5507
with perimeters:
1) Increased accuracy of the contour length parametrization from
float to double, as double should capture the difference of
32bit coord_t with full accuracy (or at least very close).
2) The algorithm to insert the T-joint points into the infill perimeter
contour was improved to avoid inserting duplicate points.
Relies to:
Concentric Fill Start Point - New Feature Request #4948
Feature Request: Archimedean Chords - Option to define direction of travel (Inside-Out or Outside-In) #5214
".gcode", ".gco", ".g" and ".ngc" were considered to be G-code file
extensions by the G-code import / export file dialogs, but not by
various other functions. Now the G-code extension is tested by
a single function is_gcode_file(string).
From the Win 2004 preset combobox lose a focus after change the preset selection and that is why the up/down arrow doesn't work properly.
So, set the focus to the combobox explicitly.
The problem is that PrintObject support generator is only run when m_layers.size() > 1, so one-layer object will skip it.
It apparently never worked, after recent refactoring (probably 8bfc986) it started to crash in GCode generator.
This commit fixes the crash, but not the problem. The raft is still not generated (like in all versions since 2.0.0 at least).
Previous implementation did not use monospace font on Linux. According to a note
from @wavexx in ba7f39a: "wxSYS_ANSI_FIXED_FONT use the same as DEFAULT in wxGtk".
This commit uses the same workaround by actually loading the font from GUI_App.
The issue was handling of the special "default_filament_profile" vector,
which is not being normalized in length to the number of extruders,
as this vector is being shown to the user at the Printer dependencies page,
and we don't want to present empty fields there, if the default filament
profile was not defined in the system preset.
