force the writing of preview buffer to make diffpatch work

simnalamburt / vim-mundo

:christmas_tree: Vim undo tree visualizer

https://simnalamburt.github.io/vim-mundo

GNU General Public License v2.0

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Closed cridemichel closed 3 years ago

cridemichel commented 3 years ago

this PR fixes issues #97 and #105, i.e.

without issuing 'w!' if the temporary file exists, the writing failed and diffpatch does not work
use 'rdiff' instead of 'diff' in undo mapping related to key 'r' and change accordingly 'diff' to 'rdiff' in function s:MundoMapGraph() in the file autoload/mundo.vim