fix: view.width functions may return strings (#3020)

* Fix get_size() function when size is a function return string

* update view.width help

---------

Co-authored-by: Alexander Courtis <alex@courtis.org>

doc/nvim-tree-lua.txt

@@ -800,22 +800,22 @@ Width of the window: can be a `%` string, a number representing columns, a
 function or a table.
 A table indicates that the view should be dynamically sized based on the
 longest line.
-  Type: `string | number | table | function()` returning a number
+  Type: `string | number | table | fun(): number|string`
   Default: `30`
 
     *nvim-tree.view.width.min*
     Minimum dynamic width.
-      Type: `string | number | function()` returning a number
+      Type: `string | number | fun(): number|string`
       Default: `30`
 
     *nvim-tree.view.width.max*
     Maximum dynamic width, -1 for unbounded.
-      Type: `string | number | function()` returning a number
+      Type: `string | number | fun(): number|string`
       Default: `-1`
 
     *nvim-tree.view.width.padding*
     Extra padding to the right.
-      Type: `number | function()` returning a number
+      Type: `number | fun(): number|string`
       Default: `1`
 
 *nvim-tree.view.float*

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 size()
+    return get_size(size())
   end
   local size_as_number = tonumber(size:sub(0, -2))
   local percent_as_decimal = size_as_number / 100