TextBox supports copy/paste with keyboard commands

elements/containers/container.go

@@ -204,6 +204,10 @@ func (element *Container) redoAll () {
 	}
 }
 
+func (element *Container) Window () tomo.Window {
+	return element.core.Window()
+}
+
 // NotifyMinimumSizeChange notifies the container that the minimum size of a
 // child element has changed.
 func (element *Container) NotifyMinimumSizeChange (child tomo.Element) {

elements/containers/document.go

@@ -202,6 +202,10 @@ func (element *DocumentContainer) partition () {
 	}
 }
 
+func (element *DocumentContainer) Window () tomo.Window {
+	return element.core.Window()
+}
+
 // NotifyMinimumSizeChange notifies the container that the minimum size of a
 // child element has changed.
 func (element *DocumentContainer) NotifyMinimumSizeChange (child tomo.Element) {

elements/containers/scroll.go

@@ -110,6 +110,10 @@ func (element *ScrollContainer) disownChild (child tomo.Scrollable) {
 	}
 }
 
+func (element *ScrollContainer) Window () tomo.Window {
+	return element.core.Window()
+}
+
 // NotifyMinimumSizeChange notifies the container that the minimum size of a
 // child element has changed.
 func (element *ScrollContainer) NotifyMinimumSizeChange (child tomo.Element) {