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When I double-click on a window in Aquamacs, it keeps the same width but maximises its height. A second double-click maximises the width as well. A third double-click returns it to its original size and position.

I would like to tell Aquamacs (http://aquamacs.org) to act more like an ordinary Mac app, so the intermediate step with the height is omitted, and a second double-click will restore the window to the original size.

A sort of work around is to use the green button at the top left of the window, taking the window to its own space, which is usually not ideal.

I can write Emacs Lisp routines to manipulate windows (a.k.a. "frames" in Aquamacs and Emacs), but I don't know how to get Emacs to run my elisp routine on the title bar double click.

Unlike a lot of user actions in Aquamacs, typing control-H control-K before the double click does not give me help on the action. So I have done some searching on the net and in the Aquamacs help. I have looked through the Preferences, options, and Customise as well. Having said that, there are a lot of things there, and I may have missed the answer.

I suspect a solution will be in the C or Objective-C source code rather than the elisp code. I suppose I can hunt through the source code to find out how to change this, but I hope I can ask for help at Ask Different.

I have Aquamacs 3.2 and macOS Sierra 10.2.3. I've also tried on some different Macs with slight version variations.

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    Did you try aquamacs.org/support.html, especially the mailing list mentioned there? – nohillside Apr 18 '17 at 9:02
  • Thanks @patrix! Yes, I visited the support page. This afternoon I started searching through the github repo, the source, the change log, and the mailing list. One discovery I have made is that the feature existed as far back as version 2.5. That narrows it down. – D A Vincent Apr 18 '17 at 9:30
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    I was more thinking about sending a mail into the mailing list there – nohillside Apr 18 '17 at 10:33
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    @patrix, good idea, but I want to make sure I've done enough research before I ask. (I may be overdoing this research. :-) Meanwhile, I've found that version 0.9.1 only zooms the height. – D A Vincent Apr 18 '17 at 10:42
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    FYI, this behavior is also present in vanilla GNU Emacs 25.1.1, so it does not appear to be specific to Aquamacs. – GDP2 Apr 18 '17 at 22:26

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