Stride.UI overhaul ideas and tasks

[Doprez]

I wanted to create a place to track the current issues with Stride.UI to see what would be required to get it up to speed.

Many people have had issues with game UI in Stride in general. Often opting to use an alternative UI like Myra or ImGUI but those are not perfect either in some scenarios.

Controls

Existing:

• Grid
• Canvas
• Button
• TextBox
• Slider
• I need to look at Stride again to remember the rest

Wants:
[ ] ImageButton
[ ] DropDown
[ ] RadioButton

Please feel free to comment below, these are my personal wants from what I have seen in other UI.

Bugs or Issues

Questions:
#2489 what should be done with the depth functionality

Bugs:
Definitely relevant:
#2236 Slider bugimplemented as well
#2171 Font issue
#2033 Cant change render group at runtime
#1130 Issue with mouse exit event not triggering
#715 Looks like this is resolved but might be worth something in the manual
#684 Better character font support
#532 Crash on value changed
#455 Performance issues

Possibly out of scope:
#2134 Might be a serializer issue again based on the comment? its a bit vague but should be easy to test by creating multiple UIs
#2084 Might be a separate issue with Input but it is affected by UI
#2189 Looks like an OpenGL issue but might be related to how the UI control was
#2387 Might actually be a serializer issue
#975 rendering order issue? this is an odd one

[Doprez]

@MechWarrior99 in Discord:

I think we should be really careful about switching out to use pre-made libraries for user-land code. It can easily lead to the engine feeling 
fragmented and a jumble of parts. Each library has its own API style and way of doing things, and we have little control over them. Like if they 
decide to make breaking changes, or we want a change they don't like, or their update frequency. It also requires users to go here and there 
to find learning resources and docs.

I do understand that of course keeping things 'in house' so to speak, does put the maintenance on us. So there are trade offs.

this was in a discussion between using Avalonia or the Stride UI and brought a great point since this has been seen a few times in Stride already.