Fix trailing white space in fluid .fl files (STR #3239).

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@10782 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

CHANGES

@@ -39,6 +39,8 @@ CHANGES IN FLTK 1.3.4					RELEASED: ??? ?? ????
 
 	Bug fixes
 
+	- fluid doesn't output trailing white space in .fl files after
+	  some statements anymore (STR #3239).
 	- Several box types were not drawn correctly when deactivated.
 	  The background color for deactivated widgets is now correct:
 	  fl_inactive(color()) (STR #2907).

fluid/file.cxx

@@ -87,11 +87,13 @@ void write_word(const char *w) {
   putc('}', fout);
 }
 
-// write an arbitrary formatted word, or a comment, etc:
+// write an arbitrary formatted word, or a comment, etc.
+// if needspace is set, then one space is written before the string
+// unless the format starts with a newline character ('\n'):
 void write_string(const char *format, ...) {
   va_list args;
   va_start(args, format);
-  if (needspace) fputc(' ',fout);
+  if (needspace && *format != '\n') fputc(' ',fout);
   vfprintf(fout, format, args);
   va_end(args);
   needspace = !isspace(format[strlen(format)-1] & 255);