Add penpot-desktop

[titus-pinta]

I have added icons for the pwa version of penpot (https://design.penpot.app/) because the default one does not respect the color scheme of Papirus.

Thank you for looking into this,
Titus

[achadwick]

[would close #3286]

Hi, @titus-pinta, and thanks for your interest.

This PR can't be accepted right now because the automated tests don't pass: some of the icon sizes are not exact pixel boundaries. The icon also needs redrawing so that all the outer lines and as much of the inner lines of the logo align on pixel boundaries. This can be quite tricky, so there are some guidelines:

• https://github.com/PapirusDevelopmentTeam/papirus-icon-theme/blob/master/tools/work/DESIGN.md
• https://github.com/PapirusDevelopmentTeam/papirus-icon-theme/wiki/Basic-concepts,-tips,-and-common-mistakes
• https://github.com/PapirusDevelopmentTeam/papirus-icon-theme/wiki/More-advanced-icon-editing

The base shape of the icon needs a highlight and a shadow too. That should be covered in the docs above.

$ make test-all 
make -C "../.." test-all
make[1]: Entering directory '[...]/papirus-icon-theme'
# >>> Searching for icons with rendering glitches
# >>> Searching for non-optimized icons
# >>> Searching for icons with embedded objects
# >>> Searching for broken symlinks
# >>> Searching for invalid icon names
# >>> Detecting decimal numbers in width/height/viewBox attrs
Papirus/24x24/apps/penpot-desktop.svg
Papirus/64x64/apps/penpot-desktop.svg
Papirus/16x16/apps/penpot-desktop.svg
Papirus/48x48/apps/penpot-desktop.svg
Papirus/22x22/apps/penpot-desktop.svg
Papirus/32x32/apps/penpot-desktop.svg
make[1]: *** [Makefile:73: test_decimal_size] Error 1
make[1]: Leaving directory '[...]/papirus-icon-theme'
make: *** [Makefile:22: test-all] Error 2

Let us know if you want to have a go at fixing it.