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bug#18195: 24.3.92; window-screen-lines is not accurate

From: Dmitry Gutov
Subject: bug#18195: 24.3.92; window-screen-lines is not accurate
Date: Thu, 07 Aug 2014 01:09:17 +0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.0

On 08/06/2014 10:36 PM, Eli Zaretskii wrote:

Multiple overlays aren't much easier to work with: you can't position
them in the middle of a piece of text that's on `display' property,

But you could copy the display string into the overlay.

I don't see how this could work with overlays that don't spread over multiple visual lines if the aforementioned text on `display' property is multiline.

Going back to one-overlay approach, this could work. But then, oh joy, instead of "go down 10 lines, collect them and add required pieces at between columns 5 and 20", I'll have to see if there's maybe a display property on line 3 that spans 15 lines, stop after it, include the display property in the text-to-be-replaced. Or, if the text with the `display' property starts before the supposed beginning of the overlay, I'll have to measure the place where to start replacing the lines from... somewhere. If there are multiple pieces of text with `display', all the merrier.

All of the above really sounds like a job for a display engine.

can't position them after the end of the buffer

Yes, you can: you can include newlines in the overlay string.

Guess so. If another package tries the same with its own overlays, it'll be a mess, but here I'm going over into fantasy territory.

or overlapping the `line-prefix' value.

Why do you need that?  No buffer text will ever appear in the prefix,
so your drop-down list doesn't need to invade the prefix area, because
it is aligned with some buffer text.

The prefixes can be different between lines. They also can be of different lengths. `org-indent-mode' is fairly popular, and it indents headings of different levels and their contents using `line-prefix'. This way, if the completion is initiated on the first column before the first header, the popup has to cover line-prefixes below. See https://github.com/company-mode/company-mode/issues/24.

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