Increased gap size in Fl_Text_Buffer to make the buffer suitable for much longer text, which seems to be a common use.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.1@5181 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

src/Fl_Text_Buffer.cxx

@@ -33,7 +33,7 @@
 #include <FL/Fl_Text_Buffer.H>
 
 
-#define PREFERRED_GAP_SIZE 80
+#define PREFERRED_GAP_SIZE 1024
 /* Initial size for the buffer gap (empty space
 in the buffer where text might be inserted
 if the user is typing sequential chars ) */