message: Add the slide layout name to the generated background image name
diff: @@ -922,7 +922,7 @@ function addBackgroundDefinition(bkg: string | BkgdOpts, target: ISlideLib | ISl
  extn: strImgExtn,
  data: bkg.data || null,
  rId: intRels,
  - Target: '../media/image' + (target.relsMedia.length + 1) + '.' + strImgExtn,
  + Target: '../media/' + target.name + '-image-' + (target.relsMedia.length + 1) + '.' + strImgExtn,
  })
  target.bkgdImgRid = intRels
  } else if (bkg && typeof bkg === 'string') {
  