Tex: Fix TEX_NAME_FLAG_OPTIONAL for the last macro parameter

When the last parameter is optional and not present, the token is
already read by parseWithStrategy() but this token is not reported
to the caller as unprocessed which may cause missed tag for the following
macro.

Author: techee

Units/parser-tex.r/newenvironment.d/expected.tags

@@ -1,3 +1,4 @@
 boxed	input.tex	/^\\newenvironment{boxed}$/;"	e
 boxedA	input.tex	/^\\renewenvironment{boxedA}$/;"	e
 theorem	input.tex	/^\\newtheorem{theorem}{Theorem}$/;"	t
+theoremA	input.tex	/^\\newtheorem{theoremA}{Theorem A}$/;"	t

Units/parser-tex.r/newenvironment.d/input.tex

@@ -1,4 +1,5 @@
 \documentclass{article}
+\newtheorem{theoremA}{Theorem A}
 \newenvironment{boxed}
     {\begin{center}
     \begin{tabular}{|p{0.9\textwidth}|}

parsers/tex.c

@@ -693,6 +693,10 @@ static bool parseWithStrategy (tokenInfo *token,
 		}
 	}
 
+	/* The last token is optional and not present - let the caller know */
+	if (!next_token)
+		*tokenUnprocessed = true;
+
 	if (name)
 		deleteToken (name);
 
@@ -991,7 +995,7 @@ static bool parseNewTheorem (tokenInfo *const token, bool *tokenUnprocessed)
 static bool parseNewcounter (tokenInfo *const token, bool *tokenUnprocessed)
 {
 	bool eof = false;
-	/* \newccounter {counter}[parentCounter] */
+	/* \newcounter {counter}[parentCounter] */
 	struct TexParseStrategy strategy [] = {
 		{
 			.type = '{',
@@ -1003,7 +1007,7 @@ static bool parseNewcounter (tokenInfo *const token, bool *tokenUnprocessed)
 		},
 		{
 			.type = '[',
-			.flags = 0,
+			.flags = TEX_NAME_FLAG_OPTIONAL,
 			.kindIndex = KIND_GHOST_INDEX,
 			.name = NULL,
 		},