New Feature: Always On Top

[DexerBR]

Sets the window to always be on top of others.

Can be modified at runtime:

• True → This will bring the window to the front and keep the window above the rest.
• False → Will restore the window's default behavior.

SDL_SetWindowAlwaysOnTop is available since SDL 2.0.16.

For testing:

from kivy.config import Config
Config.set("graphics", "always_on_top", 1)  # The app will start with the window on top

from kivy.app import App
from kivy.uix.button import Button
from kivy.core.window import Window


class AlwaysOnTopApp(App):

    def build(self):

        def do(button_instance):
            Window.always_on_top = not Window.always_on_top
            button_instance.text = f"always_on_top == {Window.always_on_top}"

        b = Button(text=f"always_on_top == {Window.always_on_top}", font_size=40)
        b.bind(on_press=do)

        return b


AlwaysOnTopApp().run()

⚠️ CI is expected to fail as this issue needs to be addressed before this PR is merged.

Maintainer merge checklist

• Title is descriptive/clear for inclusion in release notes.
• Applied a Component: xxx label.
• Applied the api-deprecation or api-break label.
• Applied the release-highlight label to be highlighted in release notes.
• Added to the milestone version it was merged into.
• Unittests are included in PR.
• Properly documented, including versionadded, versionchanged as needed.

[T-Dynamos]

also mitigates #8010

[Neizvestnyj]

LGTM

[misl6]

Hi @DexerBR ,

Good news! #8096 has been merged.

Can you please rebase on top of master so the CI can run again?

(Please be aware of the latest changes, and check the docs before testing it on your local development machine)

[misl6]

LGTM. Thank you!