Markdown: Fix rendering of '$' in non-math view mode (PR #2485 closes #2085 #2236)

Author: amrg101

app/src/main/java/net/gsantner/markor/format/markdown/MarkdownTextConverter.java

@@ -267,9 +267,13 @@ public String convertMarkup(String markup, Context context, boolean lightMode, b
         }
 
         // Enable Math / KaTex
-        if (_appSettings.isMarkdownMathEnabled() && markup.contains("$")) {
-            head += HTML_KATEX_INCLUDE;
-            head += CSS_KATEX;
+        if (markup.contains("$")) {
+            if (_appSettings.isMarkdownMathEnabled()) {
+                head += HTML_KATEX_INCLUDE;
+                head += CSS_KATEX;
+            } else {
+                markup = markup.replace("$", "\\$");
+            }
         }
 
         // Enable View (block) code syntax highlighting