Dominique Pelle wrote:
> Hi
>
> I notice a bug with conceal feature: the content of
> the fold column is not displayed correctly when using
> 'conceallevel' with a value >= 1.
>
> Steps to reproduce:
>
> 1) Enter this command:
>
> $ yes foo | head -10 | \
> vim --noplugin -u NONE \
> -c 'set foldcolumn=4 conceallevel=1' \
> -c ':3,6fold' \
> -c 'norm zR' -
>
> 2) press j in normal mode a couple of times to
> move cursor down and observe that when cursor
> goes inside the open fold, information in the
> fold column becomes blank. Pressing CTRL-L to
> redraw works around the bug.
>
> Now if you do the same with the slightly different
> command...
>
> $ yes foo | head -10 | \
> vim --noplugin -u NONE \
> -c 'set foldcolumn=4 conceallevel=1' \
> -c ':3,$fold' \
> -c 'norm zR' -
>
> You'll notice that when pressing j the foldcolumn is
> not deleted but it gets filled with '|' even where there
> is no fold.
>
> Bug does not happen when setting 'relativenumber' or
> 'cursorline'.
>
> Attached patch fixes it. However, I think it may not
> be the optimal solution (more redraws than strictly
> necessary?).
>
> The same patch also happen to fix several other redraw
> issues with conceal items not properly updated when
> using the following motion commands in normal mode...
>
> )
> ]]
> <PageUp>
> <PageDown>
> CTRL-F
> CTRL-B
> CTRL-U
> CTRL-E (when cursor is on the top line, causing scrolling)
> CTRL-Y (when cursor is on the bottom line, causing scrolling)
> CTRL-O
> CTRL-I
> [count]go
> [count]g;
>
> and it also fixes conceal item redraw issues with following Ex command:
>
> :[range]
> :go [count]
Thanks. Perhaps Vince knows how to fix this more efficiently?
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