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bug#19300: 24.4.51; visual-line-mode messes up after-string rendering wh

From: Dmitry Gutov
Subject: bug#19300: 24.4.51; visual-line-mode messes up after-string rendering when it spans all window columns
Date: Mon, 08 Dec 2014 18:40:36 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.2.0

On 12/08/2014 06:04 PM, Eli Zaretskii wrote:

visual-line-mode doesn't care about newlines, when the stuff before
the newline overflows the window width.

Right. That's why I made sure the stuff before and after each newline fits the window.

and the length of each line there equals to the value reported by

Not here:

I'm sure it does. It depends on the test data only: 34 columns in the first example, 32 columns in the second.

I need to resize a bit the windows showing the overlays, in
order to see something similar to your images.

The scenarios intentionally resize the newly popped window to make sure it's the right size.

Without overlays, even when visual-line-mode is enabled, I can make a
window body 34 chars wide and type 34 characters (maybe including
spaces) on a line without seeing them break up.

Are you saying that if you insert your test-string-1 and test-string-2
into the respective windows as buffer text, you see them displayed
differently than the overlay in the same window?

Hmm, actually no. Sorry about that. So the examples could be simplified to just insert the respective test string, without overlays.

But I can open a different window, enable visual-line-mode, take its (window-width), insert that numbers of characters on one line and not see them wrapped.

Could this be a bug in `enlarge-window-horizontally' and/or `window-width'?

If so, I cannot
reproduce this: I see both the overlay and the buffer text wrap
exactly identically.

Have you installed Fira Mono and set it up, like the first code line in the example does? This doesn't happen with the default Ubuntu font in the Emacs master, although in emacs-24 it did when I tried.

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