Destroy current image

cmd/cbconvert-gui/handlers.go

@@ -271,6 +271,7 @@ func onRemove(ih iup.Ihandle) int {
 
 // clearPreview resets the preview state and repaints the canvas to its empty state.
 func clearPreview() {
+	iup.Destroy(iup.GetHandle("cover"))
 	hasCover = false
 	previewPath = ""
 	previewPage = 0

cmd/cbconvert-gui/widgets.go

@@ -167,6 +167,7 @@ func previewMessage(ih iup.Ihandle, s string, i int, p any) int {
 		hasCover = true
 		iup.GetHandle("PreviewInfo").SetAttribute("TITLE", fmt.Sprintf("%s (%dx%d)", img.SizeHuman, img.Width, img.Height))
 	} else {
+		iup.Destroy(iup.GetHandle("cover"))
 		hasCover = false
 		iup.GetHandle("PreviewInfo").SetAttribute("TITLE", "")