fix(parser): Added logic for supporting markers inside code blocks

Improved logic for finding lines within a list item. Fixes a bug
preventing lost item markers from existing within lines of code blocks.

SUPPORT FOR TABLES WILL NOT BE ADDED AS THERE IS NO NEED TO NEST TABLES
WITHIN LIST ITEMS. BLOCK QUOTES WORK FINE SO LOGIC FOR THEM WILL NOT BE
ADDED.

See: #69

lua/markview/parser.lua

@@ -1,30 +1,55 @@
 local parser = {};
 -- local renderer = require("markview/renderer");
 
-parser.fiter_lines = function (buffer, from, to, marker)
+parser.fiter_lines = function (buffer, from, to)
 	local captured_lines = vim.api.nvim_buf_get_lines(buffer, from, to, false);
 	local filtered_lines = {};
 	local indexes = {};
 	local spaces = {};
 
+	local withinCodeBlock;
+	local parent_marker;
+
 	local tolarence = 3;
 	local found = 0;
 
 	for l, line in ipairs(captured_lines) do
-		if l ~= 1 and line:match(marker) then
-			break;
+		if l ~= 1 then
+			if withinCodeBlock ~= true and line:match("^%s*([+%-*])") then
+				break;
+			elseif withinCodeBlock ~= true and line:match("^%s*(%d+%.)") then
+				break;
+			end
 		end
 
 		if found >= tolarence then
 			break;
 		end
 
-		local spaces_before = vim.fn.strchars(line:match("(%s*)"));
+		local spaces_before = vim.fn.strchars(line:match("^(%s*)"));
 
-		if not line:match(marker) then
-			spaces_before = math.max(0, spaces_before - vim.fn.strchars(marker .. " "));
+		if line:match("(```)") and withinCodeBlock ~= true then
+			withinCodeBlock = true;
+			goto withinElement;
+		elseif line:match("(```)") and withinCodeBlock == true then
+			withinCodeBlock = false;
+			goto withinElement;
+		elseif withinCodeBlock == true then
+			goto withinElement;
 		end
 
+		if line:match("^%s*([+%-*])") then
+			parent_marker = line:match("^%s*([+%-*])");
+		elseif line:match("^%s*(%d+%.)") then
+			parent_marker = line:match("^%s*(%d+%.)");
+		end
+
+		if not line:match("^%s*([+%-*])") and not line:match("^%s*(%d+%.)") and parent_marker then
+			spaces_before = math.max(0, spaces_before - vim.fn.strchars((parent_marker or "") .. " "));
+		end
+
+		::withinElement::
+
 		table.insert(filtered_lines, line);
 		table.insert(indexes, l);
 		table.insert(spaces, spaces_before)
@@ -317,7 +342,7 @@ parser.md = function (buffer, TStree, from, to)
 			local marker_text = vim.treesitter.get_node_text(marker, buffer);
 			local symbol = marker_text:gsub("%s", "");
 
-			local list_lines, lines, spaces = parser.fiter_lines(buffer, row_start, row_end, symbol);
+			local list_lines, lines, spaces = parser.fiter_lines(buffer, row_start, row_end);
 			local spaces_before_marker = list_lines[1]:match("^(%s*)" .. symbol .. "%s*");
 
 			local c_end, _ = parser.get_list_end_range(buffer, row_start, row_end, symbol)