Collapsed window prevents windows underneath it from gaining focus

[venning]

If you have a window that is on top of another window and then use the title bar to collapse it, the windows underneath it cannot gain focus to "move to the top" of the stack. Meaning, you can't interact with their elements nor can you interact with their title bars to move them.

Once you move the collapsed window to the side and click on an "underneath" window once, it is now on top of the stack and can be interacted with and moved.

---

Reproducible example:

package main

import (
	"fmt"
	"image"

	"github.com/ebitengine/debugui"
	"github.com/hajimehoshi/ebiten/v2"
)

var count int

type Game struct {
	debugui debugui.DebugUI
}

func (g *Game) Update() error {
	_, err := g.debugui.Update(func(ctx *debugui.Context) error {
		ctx.Window("Bottom", image.Rect(50, 70, 260, 180), func(layout debugui.ContainerLayout) {
			ctx.Button(fmt.Sprintf("pushed %d times", count)).On(func() { count++ })
		})
		ctx.Window("Top", image.Rect(0, 0, 320, 240), func(layout debugui.ContainerLayout) {
			ctx.Text("first, collapse this window")
		})
		return nil
	})
	return err
}

func (g *Game) Draw(screen *ebiten.Image) {
	g.debugui.Draw(screen)
}

func (g *Game) Layout(outsideWidth, outsideHeight int) (screenWidth, screenHeight int) {
	return outsideWidth, outsideHeight
}

func main() {
	if err := ebiten.RunGame(&Game{}); err != nil {
		panic(err)
	}
}

---

Notes:

Ebitengine v2.10.3
DebugUI v0.3.0
Go go1.27.0 darwin/arm64
macOS 15.8

[hajimehoshi]

Confirmed

[iamhuman-cheolheelee]

Opened #56 for this.

[hajimehoshi]

Try 4233e17202b25a4253d1205aeaa54395d8205c64 until I release v0.3.1 a few days later. Thanks,

[venning]

Confirmed 4233e17202b25a4253d1205aeaa54395d8205c64 fixes the issue.