vim-indent-folding

Vim has some default fold methods, one of which is indentation based. However, it folds an indented block into a single line instead of folding it into the line right before the block.

Consider this markdown list:

-   Item 1
    -   Item 1.1
    -   Item 1.2

Vim's indent folding turnes this into:

-   Item 1
+--  2 lines: -   Item 1.1-------------------------------------------------

The plugin instead turns this into:

-   Item 1-----------------------------------------------------------------

This approach is inspired by http://learnvimscriptthehardway.stevelosh.com/chapters/49.html

Unfortunately, the performance of this approach is pretty bad. To mitigate this, the foldmethod is kept at manual by default and only switches to expr when the folds are actually used (e.g. when pressing za).