add 'bottom' char for a corner extension

Author: mivort

doc/nvim-tree-lua.txt

@@ -221,6 +221,7 @@ Subsequent calls to setup will replace the previous configuration.
             corner = "└",
             edge = "│",
             item = "│",
+            bottom = "─",
             none = " ",
           },
         },
@@ -728,7 +729,7 @@ UI rendering setup
 
         *nvim-tree.renderer.indent_markers.icons*
         Icons shown before the file/directory.
-          Type: `table`, Default: `{ corner = "└", edge = "│", item = "│", none = " ", }`
+          Type: `table`, Default: `{ corner = "└", edge = "│", item = "│", bottom = "─", none = " ", }`
 
     *nvim-tree.renderer.icons*
     Configuration options for icons.

lua/nvim-tree.lua

@@ -484,6 +484,7 @@ local DEFAULT_OPTS = { -- BEGIN_DEFAULT_OPTS
         corner = "└",
         edge = "│",
         item = "│",
+        bottom = "─",
         none = " ",
       },
     },

lua/nvim-tree/renderer/components/padding.lua

@@ -30,25 +30,27 @@ local function get_padding_indent_markers(depth, idx, nodes_number, markers, wit
     for i = 1, depth do
       local glyph
       if idx == nodes_number and i == depth then
-        glyph = M.config.indent_markers.icons.corner
+        local bottom_width = M.config.indent_width - 2 +
+          (with_arrows and not inline_arrows and has_folder_sibling and 2 or 0)
+        glyph = M.config.indent_markers.icons.corner ..
+          string.rep(M.config.indent_markers.icons.bottom, bottom_width) ..
+          (M.config.indent_width > 1 and " " or "")
       elseif markers[i] and i == depth then
-        glyph = M.config.indent_markers.icons.item
+        glyph = M.config.indent_markers.icons.item .. indent
       elseif markers[i] then
-        glyph = M.config.indent_markers.icons.edge
+        glyph = M.config.indent_markers.icons.edge .. indent
       else
-        glyph = M.config.indent_markers.icons.none
+        glyph = M.config.indent_markers.icons.none .. indent
       end
 
       if not with_arrows or (inline_arrows and (depth ~= i or not node.nodes)) then
-        padding = padding .. glyph .. indent
+        padding = padding .. glyph
       elseif inline_arrows then
         padding = padding
-      elseif idx == nodes_number and i == depth and has_folder_sibling then
-        padding = padding .. base_padding .. glyph .. "──" .. indent
-      elseif depth == i and not node.nodes and has_folder_sibling then
-        padding = padding .. base_padding .. glyph .. indent .. base_padding
+      elseif idx ~= nodes_number and depth == i and not node.nodes and has_folder_sibling then
+        padding = padding .. base_padding .. glyph .. base_padding
       else
-        padding = padding .. base_padding .. glyph .. indent
+        padding = padding .. base_padding .. glyph
       end
     end
   end