text/v2: Draw modifies the given GeoM unexpectedly

[hajimehoshi]

Ebitengine Version

85c0f44

Operating System

• Windows
• macOS
• Linux
• FreeBSD
• OpenBSD
• Android
• iOS
• Nintendo Switch
• PlayStation 5
• Xbox
• Web Browsers

Go Version (go version)

go version go1.22.2 darwin/arm64

What steps will reproduce the problem?

Run this test:

func TestGeoM(t *testing.T) {
	img := ebiten.NewImage(30, 30)

	op := &text.DrawOptions{}
	text.Draw(img, "Hello", text.NewGoXFace(bitmapfont.Face), op)

	if got, want := op.GeoM, (ebiten.GeoM{}); got != want {
		t.Errorf("got: %v, want: %v", got, want)
	}
}

What is the expected result?

The test passes

What happens instead?

The test fails

--- FAIL: TestGeoM (0.00s)
    text_test.go:367: got: {0 0 0 0 24 0}, want: {0 0 0 0 0 0}
FAIL

Anything else you feel useful to add?

@eihigh reported this. Thanks!