Evolving QIcon and theming

Notes

• QIcon::fromTheme() Suffers from XDG legacy. Missing many icons (last updated 2006).
• Fonts are used on both Android (Google Fonts) and Apple (SF Symbols - SF ~= "San Fransisco" font)
• Today you can have variations such as "fill", "rounded", "outline", "sharp".
• Should they be treated as themes? Maybe not? You might want non-filled and filled in the same application.
• How does that fit into the API to get QPixmaps? (e.g. I want "filled" icons):

  QPixmap QIcon::pixmap(const QSize &sz, QIcon::Mode mode = Normal, QIcon::State state = Off) const
  

• Some platforms can have palette on icons for richer color set (Google Fonts/Material)
• Current tech preview implementation have some Opt-in:

  qgetenv("QT_ENABLE_EXPERIMENTAL_ICON_ENGINES")
  

• Can we provide a default set of icons (also for those platforms who don't provide that, e.g. embedded)
• Can the naming schemes be unified across platforms (e.g. apple might use a different logical name than on Android)? => Qt can add enum (typesafe) to describe what icon you want (like QStyle::standardPixmap() ) => Don't forget that applications wants to also use their custom icons (possible today with ini files and string based lookup)
• Qt 6.7 will have a tech preview of the new icon engine implementation