From v0.7, vertsplit => WinSeparator so updated the nvimtreeversplit hl group too https://github.com/kyazdani42/nvim-tree.lua/pull/1219
From v0.7, vertsplit => WinSeparator so updated the nvimtreeversplit hl group too https://github.com/kyazdani42/nvim-tree.lua/pull/1219