ffap: disallow braces in filenames for tex modes

* lisp/ffap.el (ffap-string-at-point-mode-alist): Don't allow
braces in tex-related modes.

lisp/ffap.el

@@ -1013,6 +1013,9 @@ If a given RFC isn't in these then `ffap-rfc-path' is offered."
     (machine "-[:alnum:]." "" ".")
     ;; Mathematica paths: allow backquotes
     (math-mode ",-:$+<>@-Z_[:lower:]~`" "<" "@>;.,!?`:")
+    ;; (La)TeX: don't allow braces
+    (latex-mode "--:\\\\$+<>@-Z_[:alpha:]~*?" "<@" "@>;.,!:")
+    (tex-mode "--:\\\\$+<>@-Z_[:alpha:]~*?" "<@" "@>;.,!:")
     )
   "Alist of (MODE CHARS BEG END), where MODE is a symbol,
 possibly a major-mode name, or one of the symbols