Update to bevy 0.15

[ThierryBerger]

Currently testing on bevy 0.15 rc3.

• cursor handling changed, we rely on the new feature custom_cursor.
• more info about retained rendering world update: bevy 0.15 rc ThierryBerger/bevy_egui#5

[Friz64]

Unfinished comment

[ThierryBerger]

Thanks for pointing that out!

It's part of an actually a non trivial change: The handling of the cursor is changed in bevy 0.15 ; in this PR I moved the initialization of the cursor to the user through configure_cursor :
https://github.com/mvlabat/bevy_egui/blob/3be113b82f8b7122b33f92467d20d2560e0d7722/examples/ui.rs#L56-L60

But I think this code snippet should live with bevy_egui (or bevy_something 🤔 ; but in the meantime we should be able to add it if not present.)

[PPakalns]

Currently testing on bevy commit 9386bd0

* cursor handling changed, I think we should initialize it for all windows if not present (currently not implemented), see discussion: https://github.com/mvlabat/bevy_egui/pull/309/files#r1780569354

Just brainstorming cursor handling.
Maybe we could add for the window "EguiCursorIcon" component that bevy_egui sets.

We can provide a system that is added by default that correctly sets CursorIcon for the window from the egui EguiCursorIcon value.

But user could opt out:
User can handle manually EguiCursorIcon, it could be useful in cases where user would like to read the EguiCursorIcon state, but would want to have custom logic (For example user is utilizing a lot of custom cursor icons. He needs information from egui about cursor type, but wants to manually set their own cursor icons from icon set that do not map to SystemCursorIcon enum.

In this case it would be nice if egui would not set CursorIcon component directly.

---

Probably this functionality could be added in a PR at later date.

[khassar00]

bevy pushed version 0.15.0-rc.1

[ThierryBerger]

bevy pushed version 0.15.0-rc.1

• Thanks! I started to work on that at bevy 0.15 rc ThierryBerger/bevy_egui#5
• But the migration is not trivial due to Retain Rendering World (adopted) bevyengine/bevy#15320

[Friz64]

Also relevant: bevyengine/bevy#16093. As a workaround we can always just enable the custom_cursor feature and probably no one will notice or care, but still, it's relevant.

[ThierryBerger]

Also relevant: bevyengine/bevy#16093. As a workaround we can always just enable the custom_cursor feature and probably no one will notice or care, but still, it's relevant.

I implemented your suggestion by always enabling custom_cursor bevy feature, this is closest to previous behaviour, a future PR could easily build on that to add custom cursor support for bevy_egui, but I'll consider this out of scope for this "upgrade bevy" PR.

[vladbat00]

@Vrixyz huge thanks, as always! I've just updated it to the actual 0.15 release and merged.