In a recent Vim you can see the current ideas of the popup window design
with ":help popup". Or go to github:
https://github.com/vim/vim/blob/master/runtime/doc/popup.txt
I have been wondering about how to specify the text and highlighting.
The current proposal is using a list with text and text properties. An
alterative would be to use a buffer, like we use for a normal window.
The buffer would be an unlisted scratch buffer. It's mostly hidden from
buffer commands, so it doesn't get in the way. A bit like help buffers
(but scratch, not associated with a file).
One of the advantages is that the code to display window text can be
used, including all the settings we have for it. It's even possible to
use syntax highlighting, so that a code snippet can easily be displayed
nicely. Also takes care of text wrapping. This does imply that we also
have a window for the buffer, with window-local options.
One restriction needs to be that the buffer can never be the current
buffer. The popup does not get keyboard focus. Only the filter can be
used to intercept keys while the popup is open. The poup is not meant
to be a window to edit text. Not sure if it has a working cursor
position. And there are many commands that only work in the current
buffer, such as syntax commands, need to figure out how to deal with
those. Perhaps with ":inbuffer {nr} {cmd}".
I'm not sure how much work it is to implement this, and whether it's
less work than the list of lines. But since this is long term
functionality the amount of work is less important. At least the newly
added text properties will work right away. It might be tricky to avoid
flicker when moving the popup around.
Thoughts?
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