* bug#44483: 27.1.50; Window parameter `min-margins' doesn't split window in half
@ 2020-11-06 14:09 Joost Kremers
2020-11-06 14:41 ` Eli Zaretskii
2020-11-06 18:12 ` martin rudalics
0 siblings, 2 replies; 11+ messages in thread
From: Joost Kremers @ 2020-11-06 14:09 UTC (permalink / raw)
To: 44483
1. Open any text file, preferably with long lines (to better see the effect).
2. `M-x visual-line-mode RET`
3. `M-: (set-window-margins (selected-window) 0 150) RET`
The number 150 is arbitrary. It's appropriate for my case (with a frame width of
about 238 characters).
4. `M-: (set-window-parameter (selected-window) 'min-margins '(0 . 0)) RET`
5. `C-x 3`
At this point, I expect the window to be split into two equally-sized
side-by-side windows, but the split is at about one third of the original window
width.
Note that in this recipe, the margins of the two windows aren't adjusted after
the split, so in the left window the text is not visible at all and in the right
window, the text area is two characters wide. (In my case, YMMV.)
The original problem came up with my package `visual-fill-column-mode'
<https://github.com/joostkremers/visual-fill-column>, where the margins are
adjusted (using `window-size-change-functions'). See also my message to
emacs-devel
<https://lists.gnu.org/archive/html/emacs-devel/2020-11/msg00218.html>.
In GNU Emacs 27.1.50 (build 4, x86_64-pc-linux-gnu, GTK+ Version 3.22.30, cairo version 1.15.10)
of 2020-11-02 built on Swift
Repository revision: 4e6104ea0b7f1eb1725e81800e584b337e2da447
Repository branch: emacs-27
Windowing system distributor 'The X.Org Foundation', version 11.0.11906000
System Description: elementary OS 5.1.7 Hera
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abbrev obarray cl-preloaded nadvice loaddefs button faces cus-face macroexp
files text-properties overlay sha1 md5 base64 format env code-pages mule custom
widget hashtable-print-readable backquote threads dbusbind inotify lcms2
dynamic-setting system-font-setting font-render-setting cairo move-toolbar gtk
x-toolkit x multi-tty make-network-process emacs)
Memory information:
((conses 16 868802 161756)
(symbols 48 58233 10)
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--
Joost Kremers
Life has its moments
^ permalink raw reply [flat|nested] 11+ messages in thread
* bug#44483: 27.1.50; Window parameter `min-margins' doesn't split window in half
2020-11-06 14:09 bug#44483: 27.1.50; Window parameter `min-margins' doesn't split window in half Joost Kremers
@ 2020-11-06 14:41 ` Eli Zaretskii
2020-11-06 16:25 ` Joost Kremers
2020-11-06 18:12 ` martin rudalics
1 sibling, 1 reply; 11+ messages in thread
From: Eli Zaretskii @ 2020-11-06 14:41 UTC (permalink / raw)
To: Joost Kremers; +Cc: 44483
> From: Joost Kremers <joostkremers@fastmail.fm>
> Date: Fri, 06 Nov 2020 15:09:36 +0100
>
>
> 1. Open any text file, preferably with long lines (to better see the effect).
>
> 2. `M-x visual-line-mode RET`
>
> 3. `M-: (set-window-margins (selected-window) 0 150) RET`
>
> The number 150 is arbitrary. It's appropriate for my case (with a frame width of
> about 238 characters).
>
> 4. `M-: (set-window-parameter (selected-window) 'min-margins '(0 . 0)) RET`
>
> 5. `C-x 3`
>
> At this point, I expect the window to be split into two equally-sized
> side-by-side windows, but the split is at about one third of the original window
> width.
That expectation is incorrect by default. To have the windows
equally-sized, you need to set window-combination-resize to t, AFAIU,
otherwise Emacs makes no promise that your expectation will be heeded.
> Note that in this recipe, the margins of the two windows aren't adjusted after
> the split, so in the left window the text is not visible at all and in the right
> window, the text area is two characters wide. (In my case, YMMV.)
You expected Emacs to adjust the margins? The min-margins parameters
is consulted only when determining whether the window can be split, it
has no effect whatsoever on the window dimensions after the split.
And the manual specifically says that it is up to the application to
adjust the margins after the split.
^ permalink raw reply [flat|nested] 11+ messages in thread
* bug#44483: 27.1.50; Window parameter `min-margins' doesn't split window in half
2020-11-06 14:41 ` Eli Zaretskii
@ 2020-11-06 16:25 ` Joost Kremers
2020-11-06 18:29 ` Eli Zaretskii
0 siblings, 1 reply; 11+ messages in thread
From: Joost Kremers @ 2020-11-06 16:25 UTC (permalink / raw)
To: Eli Zaretskii; +Cc: 44483
On Fri, Nov 06 2020, Eli Zaretskii wrote:
>> From: Joost Kremers <joostkremers@fastmail.fm>
>> Date: Fri, 06 Nov 2020 15:09:36 +0100
>>
>>
>> 1. Open any text file, preferably with long lines (to better see the effect).
>>
>> 2. `M-x visual-line-mode RET`
>>
>> 3. `M-: (set-window-margins (selected-window) 0 150) RET`
>>
>> The number 150 is arbitrary. It's appropriate for my case (with a frame width of
>> about 238 characters).
>>
>> 4. `M-: (set-window-parameter (selected-window) 'min-margins '(0 . 0)) RET`
>>
>> 5. `C-x 3`
>>
>> At this point, I expect the window to be split into two equally-sized
>> side-by-side windows, but the split is at about one third of the original window
>> width.
>
> That expectation is incorrect by default.
Well, let me put it this way: If I split a window in which the margins are nil,
`split-window-right`, in my experience, always splits the window in half.
(Perhaps there are cases where that is not guaranteed, I don't know, but I've
never seen any.)
My (perhaps naive) expectation was that with `min-margins' set to (0 . 0),
`split-window' essentially treats this window as if the margins are nil, so I
expected to get a 50/50 split.
> To have the windows
> equally-sized, you need to set window-combination-resize to t, AFAIU,
> otherwise Emacs makes no promise that your expectation will be heeded.
A quick check suggests that `window-combination-resize' has no effect here. I
still get the 1/3 - 2/3 split at least some of the time. (Mind you, I'm
splitting a window that's the single window in its frame, so AFAIU there is no
window combination to speak of, and `window-combination-resize' should have no
visible effect, from what I can tell from its documentation.)
>> Note that in this recipe, the margins of the two windows aren't adjusted after
>> the split, so in the left window the text is not visible at all and in the right
>> window, the text area is two characters wide. (In my case, YMMV.)
>
> You expected Emacs to adjust the margins?
No, I don't. `visual-fill-column-mode' makes sure the margins are resized after
the split. That works as it should. I just mentioned it here because that part
of `visual-fill-column-mode' isn't replicated by the recipe. But that's not
relevant here, so just ignore it.
> The min-margins parameters
> is consulted only when determining whether the window can be split, it
> has no effect whatsoever on the window dimensions after the split.
Yeah, but that's exactly what I'm stumbling over. I've never seen such a 1/3-2/3
split, but now I'm suddenly getting it. So something is causing split-window to
treat a window with wide margins and `min-margins' set to (0 . 0) differently
from a window with no margins (but otherwise equally sized in an equally sized
frame).
Whether that something is a bug or not, I can't say. If it's not, though, I'd
really like to know if there's a workaround.
--
Joost Kremers
Life has its moments
^ permalink raw reply [flat|nested] 11+ messages in thread
* bug#44483: 27.1.50; Window parameter `min-margins' doesn't split window in half
2020-11-06 14:09 bug#44483: 27.1.50; Window parameter `min-margins' doesn't split window in half Joost Kremers
2020-11-06 14:41 ` Eli Zaretskii
@ 2020-11-06 18:12 ` martin rudalics
2020-11-06 20:36 ` Joost Kremers
1 sibling, 1 reply; 11+ messages in thread
From: martin rudalics @ 2020-11-06 18:12 UTC (permalink / raw)
To: Joost Kremers, 44483
[-- Attachment #1: Type: text/plain, Size: 1032 bytes --]
> 1. Open any text file, preferably with long lines (to better see the effect).
>
> 2. `M-x visual-line-mode RET`
>
> 3. `M-: (set-window-margins (selected-window) 0 150) RET`
>
> The number 150 is arbitrary. It's appropriate for my case (with a frame width of
> about 238 characters).
>
> 4. `M-: (set-window-parameter (selected-window) 'min-margins '(0 . 0)) RET`
>
> 5. `C-x 3`
>
> At this point, I expect the window to be split into two equally-sized
> side-by-side windows, but the split is at about one third of the original window
> width.
The problem is that when we split the original window, the new window
does not get its 'min-margins' parameter set and the subsequent
sanitizing step screws up things. Please try the attached patch.
And please look also into what happens when you shrink a frame with such
large margins to a size that won't accommodate those margins any more
unless they get shrunk. I'm afraid that the subsequent sanitizing step
might cause troubles there as well.
Thanks, martin
[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: joost.diff --]
[-- Type: text/x-patch; name="joost.diff", Size: 705 bytes --]
diff --git a/lisp/window.el b/lisp/window.el
index 48005fc93e..6c08e71aae 100644
--- a/lisp/window.el
+++ b/lisp/window.el
@@ -5414,6 +5414,12 @@ split-window
;; Sanitize sizes unless SIZE was specified.
(unless size
+ ;; Make sure the new window gets any `min-margins' parameter
+ ;; of WINDOW. Otherwise, sanitizing screws up window sizes
+ ;; considerably (Bug#44483).
+ (let ((min-margins (window-parameter window 'min-margins)))
+ (when min-margins
+ (set-window-parameter new 'min-margins min-margins)))
(window--sanitize-window-sizes horizontal))
(run-window-scroll-functions new)
^ permalink raw reply related [flat|nested] 11+ messages in thread
* bug#44483: 27.1.50; Window parameter `min-margins' doesn't split window in half
2020-11-06 16:25 ` Joost Kremers
@ 2020-11-06 18:29 ` Eli Zaretskii
0 siblings, 0 replies; 11+ messages in thread
From: Eli Zaretskii @ 2020-11-06 18:29 UTC (permalink / raw)
To: Joost Kremers; +Cc: 44483
> From: Joost Kremers <joostkremers@fastmail.fm>
> Cc: 44483@debbugs.gnu.org
> Date: Fri, 06 Nov 2020 17:25:07 +0100
>
> > That expectation is incorrect by default.
>
> Well, let me put it this way: If I split a window in which the margins are nil,
> `split-window-right`, in my experience, always splits the window in half.
> (Perhaps there are cases where that is not guaranteed, I don't know, but I've
> never seen any.)
The equal sizes are not guaranteed, but that doesn't mean they will
never happen. Especially when you put Emacs in an "impossible"
situation, where a simple split will not work.
> > To have the windows
> > equally-sized, you need to set window-combination-resize to t, AFAIU,
> > otherwise Emacs makes no promise that your expectation will be heeded.
>
> A quick check suggests that `window-combination-resize' has no effect here. I
> still get the 1/3 - 2/3 split at least some of the time.
<Shrug> It did work for me, so I'm unsure what's going on. Though I
couldn't have a window with 283 columns to begin with, so maybe it
depends on the actual sizes.
> (Mind you, I'm
> splitting a window that's the single window in its frame
So did I.
> so AFAIU there is no window combination to speak of, and
> `window-combination-resize' should have no visible effect, from what
> I can tell from its documentation.)
I think you take the name of the variable too literally.
^ permalink raw reply [flat|nested] 11+ messages in thread
* bug#44483: 27.1.50; Window parameter `min-margins' doesn't split window in half
2020-11-06 18:12 ` martin rudalics
@ 2020-11-06 20:36 ` Joost Kremers
2020-11-07 9:00 ` martin rudalics
0 siblings, 1 reply; 11+ messages in thread
From: Joost Kremers @ 2020-11-06 20:36 UTC (permalink / raw)
To: martin rudalics; +Cc: 44483
On Fri, Nov 06 2020, martin rudalics wrote:
> The problem is that when we split the original window, the new window
> does not get its 'min-margins' parameter set and the subsequent
> sanitizing step screws up things. Please try the attached patch.
Yes, the patch appears to work. After applying it, splitting a window gives me a
50/50 split. (I tried several times.)
> And please look also into what happens when you shrink a frame with such
> large margins to a size that won't accommodate those margins any more
> unless they get shrunk. I'm afraid that the subsequent sanitizing step
> might cause troubles there as well.
I'm not seeing anything unexpected here, but I'm not sure what I should be
looking at.
--
Joost Kremers
Life has its moments
^ permalink raw reply [flat|nested] 11+ messages in thread
* bug#44483: 27.1.50; Window parameter `min-margins' doesn't split window in half
2020-11-06 20:36 ` Joost Kremers
@ 2020-11-07 9:00 ` martin rudalics
2020-11-08 15:00 ` Joost Kremers
0 siblings, 1 reply; 11+ messages in thread
From: martin rudalics @ 2020-11-07 9:00 UTC (permalink / raw)
To: Joost Kremers; +Cc: 44483
>> The problem is that when we split the original window, the new window
>> does not get its 'min-margins' parameter set and the subsequent
>> sanitizing step screws up things. Please try the attached patch.
>
> Yes, the patch appears to work. After applying it, splitting a window gives me a
> 50/50 split. (I tried several times.)
I installed a slightly different fix on the Emacs 27 branch now. We
really should have had tested 'min-margins' when Emacs 25 came out but
IIRC you bowed out in the last minute back then and apparently now you
have become their first client. Since the bug shows up only when SIZE
is unspecified, the recipe I used might not have triggered it then.
In Emacs 28 I intend to remove sanity checks entirely and always
auto-shrink margins when they don't fit into a window any more. Windows
will also have a configurable minimum body width so the behavior seen
now where the entire buffer text disappears can be easily avoided.
>> And please look also into what happens when you shrink a frame with such
>> large margins to a size that won't accommodate those margins any more
>> unless they get shrunk. I'm afraid that the subsequent sanitizing step
>> might cause troubles there as well.
>
> I'm not seeing anything unexpected here, but I'm not sure what I should be
> looking at.
In an earlier posting you said that "Twice during my tests Emacs
actually hung, driving one of the CPU cores to 100%." I thought of
something similar happening when shrinking a frame.
martin
^ permalink raw reply [flat|nested] 11+ messages in thread
* bug#44483: 27.1.50; Window parameter `min-margins' doesn't split window in half
2020-11-07 9:00 ` martin rudalics
@ 2020-11-08 15:00 ` Joost Kremers
2020-11-09 8:31 ` martin rudalics
0 siblings, 1 reply; 11+ messages in thread
From: Joost Kremers @ 2020-11-08 15:00 UTC (permalink / raw)
To: martin rudalics; +Cc: 44483
On Sat, Nov 07 2020, martin rudalics wrote:
> I installed a slightly different fix on the Emacs 27 branch now. We
> really should have had tested 'min-margins' when Emacs 25 came out but
> IIRC you bowed out in the last minute back then and apparently now you
> have become their first client. Since the bug shows up only when SIZE
> is unspecified, the recipe I used might not have triggered it then.
AFAIR, the first time I heard about the `min-margins' parameter was when I
looked at the release notes of Emacs 25 after it came out. I don't remember why
I didn't try it out immediately, but after that, I probably forgot about it,
until a bug report I got a week ago.
Paul Rankin did add `min-margins' to his `olivetti' package, but he didn't
remove the pre-25 workaround that uses the `split-window' window parameter, so
the problem probably never showed up.
> In Emacs 28 I intend to remove sanity checks entirely and always
> auto-shrink margins when they don't fit into a window any more. Windows
> will also have a configurable minimum body width so the behavior seen
> now where the entire buffer text disappears can be easily avoided.
OK, so yet another way of doing things. :-) Sounds like it would make my life a
little easier, though.
Feel free to let me know when you implement it. I don't normally follow
development that closely, but in this case I'd be interested to test the new way
of doing things before the official release.
--
Joost Kremers
Life has its moments
^ permalink raw reply [flat|nested] 11+ messages in thread
* bug#44483: 27.1.50; Window parameter `min-margins' doesn't split window in half
2020-11-08 15:00 ` Joost Kremers
@ 2020-11-09 8:31 ` martin rudalics
2021-10-11 12:35 ` Stefan Kangas
0 siblings, 1 reply; 11+ messages in thread
From: martin rudalics @ 2020-11-09 8:31 UTC (permalink / raw)
To: Joost Kremers; +Cc: 44483
> AFAIR, the first time I heard about the `min-margins' parameter was when I
> looked at the release notes of Emacs 25 after it came out. I don't remember why
> I didn't try it out immediately, but after that, I probably forgot about it,
> until a bug report I got a week ago.
>
> Paul Rankin did add `min-margins' to his `olivetti' package, but he didn't
> remove the pre-25 workaround that uses the `split-window' window parameter, so
> the problem probably never showed up.
You're right. It was Paul, who said that he didn't need 'min-margins'
and never reported whether they worked at all. Sorry for the confusion
but I lost my recordings of past conversations.
>> In Emacs 28 I intend to remove sanity checks entirely and always
>> auto-shrink margins when they don't fit into a window any more. Windows
>> will also have a configurable minimum body width so the behavior seen
>> now where the entire buffer text disappears can be easily avoided.
>
> OK, so yet another way of doing things. :-) Sounds like it would make my life a
> little easier, though.
It's pretty hard to accommodate all expectations here. Consider a user
who wants line numbers to remain visible even if everything else has
disappeared after a window has shrunk: With line numbers displayed in
margins, margins should prevail. With display-line-numbers, buffer text
should prevail. A minimum body width will help users to make that
decision. Yet users still have to interfere "manually" in order to
communicate their intentions to Emacs.
> Feel free to let me know when you implement it. I don't normally follow
> development that closely, but in this case I'd be interested to test the new way
> of doing things before the official release.
I'll send you a patch as soon as I consider it stable enough.
martin
^ permalink raw reply [flat|nested] 11+ messages in thread
* bug#44483: 27.1.50; Window parameter `min-margins' doesn't split window in half
2020-11-09 8:31 ` martin rudalics
@ 2021-10-11 12:35 ` Stefan Kangas
2021-10-11 17:18 ` martin rudalics
0 siblings, 1 reply; 11+ messages in thread
From: Stefan Kangas @ 2021-10-11 12:35 UTC (permalink / raw)
To: martin rudalics; +Cc: Joost Kremers, 44483
martin rudalics <rudalics@gmx.at> writes:
>> AFAIR, the first time I heard about the `min-margins' parameter was when I
>> looked at the release notes of Emacs 25 after it came out. I don't remember why
>> I didn't try it out immediately, but after that, I probably forgot about it,
>> until a bug report I got a week ago.
>>
>> Paul Rankin did add `min-margins' to his `olivetti' package, but he didn't
>> remove the pre-25 workaround that uses the `split-window' window parameter, so
>> the problem probably never showed up.
>
> You're right. It was Paul, who said that he didn't need 'min-margins'
> and never reported whether they worked at all. Sorry for the confusion
> but I lost my recordings of past conversations.
>
>>> In Emacs 28 I intend to remove sanity checks entirely and always
>>> auto-shrink margins when they don't fit into a window any more. Windows
>>> will also have a configurable minimum body width so the behavior seen
>>> now where the entire buffer text disappears can be easily avoided.
>>
>> OK, so yet another way of doing things. :-) Sounds like it would make my life a
>> little easier, though.
>
> It's pretty hard to accommodate all expectations here. Consider a user
> who wants line numbers to remain visible even if everything else has
> disappeared after a window has shrunk: With line numbers displayed in
> margins, margins should prevail. With display-line-numbers, buffer text
> should prevail. A minimum body width will help users to make that
> decision. Yet users still have to interfere "manually" in order to
> communicate their intentions to Emacs.
>
>> Feel free to let me know when you implement it. I don't normally follow
>> development that closely, but in this case I'd be interested to test the new way
>> of doing things before the official release.
>
> I'll send you a patch as soon as I consider it stable enough.
That was in November last year. Any news here?
^ permalink raw reply [flat|nested] 11+ messages in thread
* bug#44483: 27.1.50; Window parameter `min-margins' doesn't split window in half
2021-10-11 12:35 ` Stefan Kangas
@ 2021-10-11 17:18 ` martin rudalics
0 siblings, 0 replies; 11+ messages in thread
From: martin rudalics @ 2021-10-11 17:18 UTC (permalink / raw)
To: Stefan Kangas; +Cc: Joost Kremers, 44483, control
close 44483 27.2
quit
>> I'll send you a patch as soon as I consider it stable enough.
>
> That was in November last year. Any news here?
That project was abandoned earlier this year. The original bug should
have been fixed back then though so I am closing this bug.
martin
^ permalink raw reply [flat|nested] 11+ messages in thread
end of thread, other threads:[~2021-10-11 17:18 UTC | newest]
Thread overview: 11+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2020-11-06 14:09 bug#44483: 27.1.50; Window parameter `min-margins' doesn't split window in half Joost Kremers
2020-11-06 14:41 ` Eli Zaretskii
2020-11-06 16:25 ` Joost Kremers
2020-11-06 18:29 ` Eli Zaretskii
2020-11-06 18:12 ` martin rudalics
2020-11-06 20:36 ` Joost Kremers
2020-11-07 9:00 ` martin rudalics
2020-11-08 15:00 ` Joost Kremers
2020-11-09 8:31 ` martin rudalics
2021-10-11 12:35 ` Stefan Kangas
2021-10-11 17:18 ` martin rudalics
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