fix special latex character escaper

rendercv/renderer/templater.py

@@ -336,6 +336,9 @@ def escape_latex_characters(latex_string: str) -> str:
 
     # Dictionary of escape characters:
     escape_characters = {
+        "{": "\\{",
+        "}": "\\}",
+        "\\": "\\textbackslash{}",
         "#": "\\#",
         "%": "\\%",
         "&": "\\&",

tests/test_renderer.py

@@ -124,6 +124,10 @@ def test_markdown_file_class(tmp_path, rendercv_data_model, jinja2_environment):
             "$$a=5_4^3 % & #$$ # $$aaaa ___ &&$$",
             "$a=5_4^3 % & #$ \\# $aaaa ___ &&$",
         ),
+        (
+            "$\\mathcal{O}(n^2)$ to $\\mathcal{O}(n \\log n)$",
+            "\\$\\textbackslash{}mathcal\\{O\\}(n\\textasciicircum{}2)\\$ to \\$\\textbackslash{}mathcal\\{O\\}(n \\textbackslash{}log n)\\$",
+        ),
     ],
 )
 def test_escape_latex_characters(string, expected_string):