Hari Rana

[Feature request]: Allow using multiple base apps

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### Checklist - [X] I agree to follow the [Code of Conduct](https://github.com/flatpak/flatpak/blob/main/CODE_OF_CONDUCT.md) that this project adheres to. - [X] I have searched the [issue tracker](https://www.github.com/flatpak/flatpak/issues) for a feature request that...

# Description Perceptibly, this is probably 100× faster (without exaggeration) than what we currently have: https://github.com/user-attachments/assets/ddc52f12-3bca-4551-9087-9cd61b11b57d The following commits were removed from this PR, but they'll be referenced in future...

window: Port to modern widgets

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Closes https://github.com/bottlesdevs/Bottles/issues/3562 Depends on https://github.com/bottlesdevs/Bottles/pull/3691

Provide a Gtk.Application and Gtk.ApplicationWindow subclass

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### Problem Given that, eventually, we want to add functionality on either at the application-level and/or top-level instances, such as https://github.com/elementary/granite/issues/838, we'd want a way to make use of those...

Default icon themes by non-Pantheon desktops may have missing icons or use incorrect icons

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### What Happened? When using a desktop that uses a different default icon theme, such as GNOME and "Adwaita", Granite will naively pick up that icon theme, as opposed to...