Not escaping dollar signs

[jaylogue]

Describe the bug

Based on long standing habit, many of my notes use a triple dollar sign ($$$) as to-do marker (I mean, who doesn't notice dollar signs, right?). However, upon conversion these produced an error when rendered in WYSIWYG mode:

KaTex parse error: Can't use function '$' in math mode

To Reproduce

Convert a notebook containing the text "$$$" to Joplin format.

Expected behavior

Dollar signs are properly escaped when viewed in md editor.

Desktop (please complete the following information):

• OneNodeMdExporter version : v1.5.0.0
• Windows version : Windows 10 64 bits
• Office Version : 2013 64 bits