tips
:h clear-undo When you set 'undolevels' to -1 the undo information is not immediately cleared, this happens at the next change. To force clearing the undo information you can use these commands: > :let old_undolevels = &undolevels :set und…
:h clear-undo When you set 'undolevels' to -1 the undo information is not immediately cleared, this happens at the next change. To force clearing the undo information you can use these commands: > :let old_undolevels = &undolevels :set und…