Don't crash when user hovers over nothing

containerbox.go

@@ -119,10 +119,14 @@ func (this *containerBox) Insert (child, before tomo.Object) {
 
 	beforeBox := assertAnyBox(before.GetBox())
 	index     := indexOf(this.children, tomo.Box(beforeBox))
-	if index < 0 { return }
-
+	
+	if index < 0 {
+		this.children = append(this.children, tomo.Box(box))
+	} else {
+		this.children = insert(this.children, index, tomo.Box(box))
+	}
 	box.setParent(this)
-	this.children = insert(this.children, index, tomo.Box(box))
+
 	this.invalidateLayout()
 	this.invalidateMinimum()
 }

event.go

@@ -339,11 +339,13 @@ func (window *window) handleMotionNotify (
 	}
 
 	underneath := window.boxUnder(image.Pt(x, y), eventCategoryMouse)
-	window.hover(underneath)
-	
-	if !handled {
-		underneath.handleMouseMove()
+	if underneath != nil {
+		window.hover(underneath)
+		if !handled {
+			underneath.handleMouseMove()
+		}
 	}
+	
 }
 
 func (window *window) compressExpose (

go.mod

@@ -3,8 +3,8 @@ module git.tebibyte.media/tomo/x
 go 1.20
 
 require (
-	git.tebibyte.media/tomo/tomo v0.29.0
-	git.tebibyte.media/tomo/typeset v0.7.0
+	git.tebibyte.media/tomo/tomo v0.31.0
+	git.tebibyte.media/tomo/typeset v0.7.1
 	git.tebibyte.media/tomo/xgbkb v1.0.1
 	github.com/jezek/xgb v1.1.0
 	github.com/jezek/xgbutil v0.0.0-20230603163917-04188eb39cf0

go.sum

@@ -1,8 +1,8 @@
 git.tebibyte.media/sashakoshka/xgbkb v1.0.0/go.mod h1:pNcE6TRO93vHd6q42SdwLSTTj25L0Yzggz7yLe0JV6Q=
-git.tebibyte.media/tomo/tomo v0.29.0 h1:uvdPaEQYcWH965y85SjIKwhLklnTbs+x6MRwLfdRvfo=
-git.tebibyte.media/tomo/tomo v0.29.0/go.mod h1:C9EzepS9wjkTJjnZaPBh22YvVPyA4hbBAJVU20Rdmps=
-git.tebibyte.media/tomo/typeset v0.7.0 h1:JFpEuGmN6R2XSCvkINYxpH0AyYUqqs+dZYr6OSd91y0=
-git.tebibyte.media/tomo/typeset v0.7.0/go.mod h1:PwDpSdBF3l/EzoIsa2ME7QffVVajnTHZN6l3MHEGe1g=
+git.tebibyte.media/tomo/tomo v0.31.0 h1:LHPpj3AWycochnC8F441aaRNS6Tq6w6WnBrp/LGjyhM=
+git.tebibyte.media/tomo/tomo v0.31.0/go.mod h1:C9EzepS9wjkTJjnZaPBh22YvVPyA4hbBAJVU20Rdmps=
+git.tebibyte.media/tomo/typeset v0.7.1 h1:aZrsHwCG5ZB4f5CruRFsxLv5ezJUCFUFsQJJso2sXQ8=
+git.tebibyte.media/tomo/typeset v0.7.1/go.mod h1:PwDpSdBF3l/EzoIsa2ME7QffVVajnTHZN6l3MHEGe1g=
 git.tebibyte.media/tomo/xgbkb v1.0.1 h1:b3HDUopjdQp1MZrb5Vpil4bOtk3NnNXtfQW27Blw2kE=
 git.tebibyte.media/tomo/xgbkb v1.0.1/go.mod h1:P5Du0yo5hUsojchW08t+Mds0XPIJXwMi733ZfklzjRw=
 github.com/BurntSushi/freetype-go v0.0.0-20160129220410-b763ddbfe298 h1:1qlsVAQJXZHsaM8b6OLVo6muQUQd4CwkH/D3fnnbHXA=

x/plugin.go

@@ -1,17 +0,0 @@
-// Plugin x provides the X11 backend as a plugin.
-package main
-
-import "git.tebibyte.media/tomo/x"
-import "git.tebibyte.media/tomo/tomo"
-
-func init () {
-	tomo.Register(0, tomo.Factory(x.NewBackend))	
-}
-
-func Name () string {
-	return "X"
-}
-
-func Description () string {
-	return "Provides an X11 backend."
-}