issue #8564 input buffer overflow, can't enlarge buffer because scanner uses REJECT

When we have a very large "LONGSTRINBLOCK" (e.g. a very large documentation part or an encode executable in e.g. base64 encoding) , there are a lot of lines that have to be read at once, this is not really necessary they can be read sequentially (probably at the cost of some speed)

Author: albert-github

src/pycode.l

@@ -183,7 +183,7 @@ LONGSTRINGCHAR    [^\\"']
 ESCAPESEQ         ("\\")(.)
 LONGSTRINGITEM    ({LONGSTRINGCHAR}|{ESCAPESEQ})
 SMALLQUOTE        ("\"\""|"\""|"'"|"''")
-LONGSTRINGBLOCK   ({LONGSTRINGITEM}+|{SMALLQUOTE})
+LONGSTRINGBLOCK   ({LONGSTRINGITEM}|{SMALLQUOTE})
 
 SHORTSTRING       ("'"{SHORTSTRINGITEM}*"'"|'"'{SHORTSTRINGITEM}*'"')
 SHORTSTRINGITEM   ({SHORTSTRINGCHAR}|{ESCAPESEQ})

src/pyscanner.l

@@ -180,7 +180,7 @@ LONGSTRINGCHAR    [^\\"']
 ESCAPESEQ         ("\\")(.)
 LONGSTRINGITEM    ({LONGSTRINGCHAR}|{ESCAPESEQ})
 SMALLQUOTE        ("\"\""|"\""|"'"|"''")
-LONGSTRINGBLOCK   ({LONGSTRINGITEM}+|{SMALLQUOTE})
+LONGSTRINGBLOCK   ({LONGSTRINGITEM}|{SMALLQUOTE})
 
 SHORTSTRING       ("'"{SHORTSTRINGITEM}*"'"|'"'{SHORTSTRINGITEM}*'"')
 SHORTSTRINGITEM   ({SHORTSTRINGCHAR}|{ESCAPESEQ})