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List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.devel:317324 Archived-At: >> IIUC handling overlays with a 'window' property with current means is >> much too cumbersome. One would have to investigate all overlays in the >> window's buffer and duplicate them if they have a 'window' property that >> references the cloned window. In practice, most overlays don't have >> such a property. > > But crucially, the overlay that implements region highlighting does. This, cursor face highlighting and rectangle overlays are special. They change with the selected window, the region and/or the position of point and must be regenerated in every redisplay cycle anyway. Which means that they need no special attention when cloning a frame or window configuration. Others, like the one used by 'hl-line-mode' are handled via a post command hook and probably need no special attention either. The overlays used by 'compare-windows-highlight' or 'isearch-lazy-highlight-match' seem more sensitive in this regard. I doubt that they would survive a change where windows do not preserve their identity. martin