Currently:
* 48to49 upgrades the machine stacks from 4000016 to 50000**16**
* 49to50 upgrades the machine stacks from 4000016 to 50000**18**
As a result, the versionUpgrader in arachne skips the 48to49 because it sees that the 49to50 also increments the setting version.
This is now fixed by making sure that the 49to50 upgrades from **5**000016 to 5000018.
CURA-8468
The `tooltipWidth` property is not available in 4.9 and 4.10. This property was added to make sure that the tooltip has a smaller width than the DigitalLibrary window, or else the tooltip doesn't get drawn at all, which is confusing. Since it was not available in 4.9 and 4.10, the tooltip text smaller had to become smaller to make sure that it will fit.
CURA-8444
The `leftIcon` property, which is not available in 4.9 and 4.10, so the DigitalLibrary window wasn't getting drawn. To keep having the icon, I manually added the RecolorImage in the search textfield.
CURA-8444
This will hopefully prevent people from messing with the installed files (and then getting confused when they upgrade) when they should be using the configuration (sub-)folder(s) instead. If I read cura-build correctly, just placing the files here will already copy them to the right directory, since that happens for all folders (and hopefully files) for those directories anyway.
This will make the translations more reasonable (instead of translating "open file" and "from Disk" separately, which could make the some translation results making less sense.
CURA-8411
QtSVG doesn't support clipping paths. QtSVG only supports the SVG 1.2 Tiny specification. See https://doc.qt.io/qt-5/svgrendering.html for more information on exact support.
If the user had specialised settings fixing the number of walls or skin layers to an integer number, this fixed value would get copied over from the extruder settings, causing infill meshes to have walls by default.
This is unintuitive. We want infill meshes to behave like it's only infill by default. So remove all of those overrides so that only infill gets printed there, by default.
The user may still change the number of walls or skin layers or their parent settings. But by default it should now behave like infill within infill, regardless of the user's setting overrides.
Fixes issue CURA-8393 and fixes#9815.
When working with --external-backend, the engine just stops responding, and the operating system cleans up its socket connection. From Cura's front-end we then just see the socket reset. So we should interpret a reset socket to mean that the slicing process was halted.
When not working with an external backend, a crash would always give a response code and we can base it on that instead (as previously implemented).
Contributes to issue CURA-6568.
