Fixed visualization of G-code in G-code viewer after 07e7e11590
The line end positions were not extracted correctly from G-code
imported into a stand-alone G-code viewer.
- do not show memory in MB, show it in GiB rounded to one decimal place
- when sending fails, the HTTP error code is not presented to the user (it is logged though)
- when the user cancels the sending, no extra "sending cancelled" message is shown
- in case there is no internet connection, the dialog is not shown at all
- a 6 second timeout for a case that connection is lost during sending
- the dialog is only shown when the wizard does not show on startup
flip direction of the infill layer with each interface layer.
Unfortunately the flipping of support interface directions may not work
reliably due to base support layer heights growing at different rate
from the interface layers.
for offset2() with clear meaning.
New ClipperUtils functions: expand(), shrink() as an alternative
for offset() with clear meaning.
All offset values for the new functions are positive.
Various offsetting ClipperUtils (offset, offset2, offset2_ex) working
over Polygons were marked as unsafe, sometimes producing invalid output
if called for more than one polygon. These functions were reworked
to offset polygons one by one. The new functions working over Polygons
shall work the same way as the old safe ones working over ExPolygons,
but working with Polygons shall be computationally more efficient.
Improvements in FDM support generator:
1) For both grid and snug supports: Don't filter out supports for which
the contacts are completely reduced by support / object XY separation.
2) Rounding / merging of supports using the closing radius parameter is
now smoother, it does not produce sharp corners.
3) Snug supports: When calculating support interfaces, expand the projected
support contact areas to produce wider, printable and more stable interfaces.
4) Don't reduce support interfaces for snug supports for steep overhangs,
that would normally not need them. Snug supports often produce very
narrow support interface regions and turning them off makes the support
interfaces disappear.
