range from source doesn't seem to use correct column

Describe the bug

if I use viw to select function name, range_from_source still return the whole line

Steps to reproduce

	local start = vim.fn.getpos("v")
	local end_ = vim.fn.getpos(".")
	local start_row = start[2]
	local start_col = start[3]
	local end_row = end_[2]
	local end_col = end_[3]

	-- A user can start visual selection at the end and move backwards
	-- Normalize the range to start < end
	if start_row == end_row and end_col < start_col then
		end_col, start_col = start_col, end_col
	elseif end_row < start_row then
		start_row, end_row = end_row, start_row
		start_col, end_col = end_col, start_col
	end
	if vim.api.nvim_get_mode().mode == "V" then
		start_col = 1
		local lines = vim.api.nvim_buf_get_lines(0, end_row - 1, end_row, true)
		end_col = #lines[1]
	end
	return {
		["start"] = { start_row, start_col - 1 },
		["end"] = { end_row, end_col - 1 },
	}

Expected behavior

return exact column

Neovim version (nvim -v)

NVIM v0.10.1 Build type: Debug LuaJIT 2.1.1713484068 Run "nvim -V1 -v" for more info

lspsaga commit

latest

Terminal name/version

tmux

Start by locating the range_from_source implementation in the lspsaga.nvim source and reproduce the issue in Neovim using the provided visual-selection example. Trace how start_col and end_col are converted into the returned range, then verify that selecting a function name returns its exact columns rather than the whole line.