bug#56357: Request for font size adaptation that fits window

[carlmarcos]

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Jul 4, 2022, 11:42 by eliz@gnu.org:

Cc: 56357@debbugs.gnu.org

From: Lars Ingebrigtsen <larsi@gnus.org>

Date: Mon, 04 Jul 2022 13:01:20 +0200

carlmarcos@tutanota.com writes:

> Suppose a user uses a 13 pt font size. Let there be some space

> between the longest line in the buffer and the edge of the window. It

> would be super if the font size could be automatically increased, such

> that the difference between the longest line and the window size in

> minimised.

I think that sounds like a useful feature, and I'm kinda surprised that

it doesn't exist yet. Or does it? Anybody know?

To implement this, I guess the obvious thing would be to have a global

minor mode that'd listen to frame size changes, and then adjust the font

size up/down to reach the desired number of characters in a frame? So

we'd have a user option font-size-adjust-target (defaulting to 80)

and a font-size-adjust-mode?

That's not what the feature request asked for, AFAIU: it wanted

dynamic resizing, and it wanted the size to depend on the "longest

line" (not clear if "longest in the window" or "longest in the

buffer").

Correct, a dynamic resizing based on "longest in the buffer".  I would say that

one would not want frequent resizing either.  Though I am not best to state how the

dynamic resizing could get activated.  Then again there should be a limit of the size

of the font for instances where the resizing would get too big for files with short lines.

With your proposal, how would you determine the target value? If it's

just an arbitrary value (80 sounds like an arbitrary one to me), then

the recently-added global-text-scale-adjust-resizes-frames variable

does the same, just from the other end: the user enlarges the font and

the frame follows suit. And since our default frame width is already

set for 80 characters, it sounds like we already have the feature you

envisioned, no?