fix(#3015): right-aligned icons are taken into account in grow

lua/nvim-tree/view.lua

@@ -119,7 +119,7 @@ local function get_size(size)
   if type(size) == "number" then
     return size
   elseif type(size) == "function" then
-    return get_size(size())
+    return size()
   end
   local size_as_number = tonumber(size:sub(0, -2))
   local percent_as_decimal = size_as_number / 100
@@ -321,8 +321,17 @@ local function grow()
     max_width = get_width(M.View.max_width) - padding
   end
 
-  for _, l in pairs(lines) do
+  local ns_id = vim.api.nvim_get_namespaces()["NvimTreeExtmarks"]
+  for line_nr, l in pairs(lines) do
     local count = vim.fn.strchars(l)
+    -- also add space for right-aligned icons
+    local extmarks = vim.api.nvim_buf_get_extmarks(0, ns_id, { line_nr, 0 }, { line_nr, -1 }, { details = true } )
+    for _, extmark in ipairs(extmarks) do
+      local virt_texts = extmark[4].virt_text
+      for _, virt_text in ipairs(virt_texts) do
+        count = count + vim.fn.strchars(virt_text[1])
+      end
+    end
     if resizing_width < count then
       resizing_width = count
     end