feat: use treesitter range for virtual indent by default

When a user adds stars to a headline, the content in the region now all
gets correctly virtually indented.

lua/orgmode/ui/virtual_indent.lua

@@ -45,8 +45,23 @@ end
 ---@param bufnr number buffer id
 ---@param start_line number start line number to set the indentation, 0-based inclusive
 ---@param end_line number end line number to set the indentation, 0-based inclusive
-function VirtualIndent:set_indent(bufnr, start_line, end_line)
-  self:_delete_old_extmarks(bufnr, start_line, end_line)
+---@param ignore_ts? boolean whether or not to skip the treesitter start & end lookup
+function VirtualIndent:set_indent(bufnr, start_line, end_line, ignore_ts)
+  ignore_ts = ignore_ts or false
+  local headline = self.lib.headline.from_cursor({ start_line + 1, 1 })
+  if headline and not ignore_ts then
+    local parent = headline.headline:parent()
+    if parent then
+      for node in parent:iter_children() do
+        if node:type() == 'body' then
+          start_line = node:start()
+          end_line = node:end_()
+          break
+        end
+      end
+    end
+  end
+  self:_delete_old_extmarks(bufnr, start_line - 1, end_line)
   for line = start_line, end_line do
     local indent = self:_get_indent_size(line)
 
@@ -64,7 +79,7 @@ end
 ---@param bufnr? number buffer id
 function VirtualIndent:attach(bufnr)
   bufnr = bufnr or 0
-  self:set_indent(0, 0, vim.api.nvim_buf_line_count(bufnr) - 1)
+  self:set_indent(0, 0, vim.api.nvim_buf_line_count(bufnr) - 1, true)
 
   vim.api.nvim_buf_attach(bufnr, false, {
     on_lines = function(_, _, _, start_line, _, end_line)