undo key triggers "E684: list index out of range: 5" about vim-anyfold HOT 6 CLOSED

I can not reproduce this, can you be more specific in what situation this happens (what is the action you undo?). I can not see how the index can be out of range, since this line where the error happens is only executed if the total number of lines has not changed (anyfold_ind_actual is a list of size number of lines).

from vim-anyfold.

Sorry about the lack of instructions to reproduce the issue. 😰 Try this:

1. Start Vim.
2. Run :setfiletype mail
3. Insert the word "hello" by typing ihello<ESC>
4. Open a new line and insert "world" by typing oworld<ESC>
5. Trigger the undo mechanism by typing u
6. Observe the error message.

from vim-anyfold.

Thanks! But I don't get an error message. In fact, when I undo, the line that triggers the error message is not even executed (it should not be executed if the number of lines has changed).

Could you try the following to narrow down the bug:

in autoload/anyfold.vim of the vim-anyfold directory, put a statement that prints delta_lines, this is the number of lines that have been added / removed:

diff --git a/autoload/anyfold.vim b/autoload/anyfold.vim
index e293498..a5bac91 100644
--- a/autoload/anyfold.vim
+++ b/autoload/anyfold.vim
@@ -369,6 +369,7 @@ function! s:ReloadFolds(lnum) abort

     let delta_lines = line('$') - len(b:anyfold_ind_actual)

+    echom delta_lines
     if delta_lines == 0
         let indents_same = 1
         let curr_line = changed[0]

Then run the example you specified above. Afterwards get the printed numbers by running :messages. What numbers do you see (ignoring all messages that are not a number)? I get 0, 1, -1, as expected.

from vim-anyfold.

I could reproduce the issue with a similar example:

1. Start Vim
2. type ihello<ESC>
3. yank and paste hello to end of line by typing yiw$p
4. Trigger the undo mechanism by typing u

This must be a bug of vim: when you now try to jump to last changed character using '], you get the error message
E19: Mark has invalid line number

vim-anyfold is relying on '[ & '] to get the first and last line of the changed text.

I'll implement a workaround that checks that '] does not exceed the last line.

from vim-anyfold.

I committed a workaround that solves this problem for vim-anyfold and I filed an issue vim/vim#1281.

from vim-anyfold.

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