From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Alan Third Newsgroups: gmane.emacs.bugs Subject: bug#50112: 28.0.50; ediff help frame does not display text Date: Sat, 21 Aug 2021 13:18:53 +0100 Message-ID: References: <67AE7889-E5EE-4BBA-8B2B-2E4C04EF2EFB@cfa.harvard.edu> <87pmu97e55.fsf@gnus.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="24815"; mail-complaints-to="usenet@ciao.gmane.io" Cc: pillule@riseup.net, 50112@debbugs.gnu.org, David Phillips To: Lars Ingebrigtsen Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Sat Aug 21 14:20:11 2021 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1mHPys-0006Fc-9d for geb-bug-gnu-emacs@m.gmane-mx.org; 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h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=TNF0tsD9J7gqKzU7s1NbkemowzQdmdKlIG5wIOa1C/tnz9z6Hptal+ypWTuH8JZHe bRnAOcmIb16GCTLC+VmxKRfBNPTcUpfbgYqmudoVNuI1JczI0QULM0bMHPBQyR2DkJ MLS6Bks9CtbF+inNUKnQ7pLu9k50M4W6vrcJ0oadBsfQH257ysMZ/y5I/zpjnJEUx0 XWQkyKisnIAINzMo5GG2KVUcNMFL2Hpp35pe6Q3z3vBXQMBGh9Xd33Hv9GcNrVT/8H W8P7CCC8LFmvxpH0vL5AONCC/xPWXpYqu6J+KaIhe2hVzCLrEkONmxM6Elhx4ekBEo weVg8chyZRsUg== Original-Received: by breton.holly.idiocy.org (Postfix, from userid 501) id 003B0202D5944A; Sat, 21 Aug 2021 13:18:53 +0100 (BST) Mail-Followup-To: Alan Third , Lars Ingebrigtsen , David Phillips , 50112@debbugs.gnu.org, pillule@riseup.net Content-Disposition: inline In-Reply-To: <87pmu97e55.fsf@gnus.org> X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:212334 Archived-At: On Thu, Aug 19, 2021 at 03:33:26PM +0200, Lars Ingebrigtsen wrote: > David Phillips writes: > > > I built emacs this morning from the git master branch. > > The latest commit was 9b31ad36094666da6b3281025adc163829d89de8 with > > a date stamp of Wed Aug 18 20:02:39 2021 +0300. > > I am running the macos GUI version. > > First I run /Applications/Emacs/Contents/MacOS/Emacs -Q > > then I load two files and run 'ediff-buffers' to compare them. > > ediff works just fine except that the frame with the help message > > is an empty frame. The '?' command changes the frame size but the > > text never renders. > > I can reproduce this problem on Macos, but not in Debian. > > > Perhaps Alan has some insight here; added to the CCs. This is a bit weird. When creating the graphics context to draw on we need to specify a colorspace, so we just use the one that the (OS) window we're drawing for uses. However sometimes it seems we get a null from the window instead of a legit colorspace which causes the graphics context creation to fail. I don't know why we should ever get a null, but anyway, I've pushed a change to master that should use a generic colorspace in these situations. -- Alan Third