fix: account for link icons added to headings when computing width

# Details

Issue: #124

Calculation for heading width did not take into account any inlined
link icons added. This would cause text to be hidden when using the
block width.

To fix this use similar logic to the table padding caclulation and add
the width of any inlined icons.

Author: MeanderingProgrammer

lua/render-markdown/handler/markdown.lua

@@ -103,7 +103,7 @@ function Handler:heading(info)
         local width = heading.left_pad + icon_width + heading.right_pad
         local content = info:sibling('inline')
         if content ~= nil then
-            width = width + str.width(content.text) - content:concealed()
+            width = width + str.width(content.text) + self:added_width(content) - content:concealed()
         end
         self:add(true, info.start_row, 0, {
             priority = 0,
@@ -593,11 +593,18 @@ end
 ---@param info render.md.NodeInfo
 ---@return integer
 function Handler:table_visual_offset(info)
-    local result = info:concealed()
+    return info:concealed() - self:added_width(info)
+end
+
+---@private
+---@param info render.md.NodeInfo
+---@return integer
+function Handler:added_width(info)
+    local result = 0
     local icon_ranges = context.get(self.buf):get_links(info.start_row)
     for _, icon_range in ipairs(icon_ranges) do
         if info.start_col < icon_range[2] and info.end_col > icon_range[1] then
-            result = result - str.width(icon_range[3])
+            result = result + str.width(icon_range[3])
         end
     end
     return result

lua/render-markdown/health.lua

@@ -5,7 +5,7 @@ local M = {}
 
 ---@private
 ---@type string
-M.version = '6.0.6'
+M.version = '6.0.7'
 
 function M.check()
     vim.health.start('render-markdown.nvim [version]')