Fix \Q\E quantification bug.

ChangeLog

@@ -218,6 +218,10 @@ followed by a caseful back reference, could lose the caselessness of the first
 repeated back reference (example: /(Z)(a)\2{1,2}?(?-i)\1X/i should match ZaAAZX 
 but didn't).
 
+35. If \Q was preceded by a quantified item, and the following \E was followed 
+by '?' or '+', and there was at least one literal character between them, an 
+internal error "unexpected repeat" occurred (example: /.+\QX\E+/).
+
 
 Version 10.22 29-July-2016
 --------------------------

src/pcre2_compile.c

@@ -2327,6 +2327,7 @@ while (ptr < ptrend)
         parsed_pattern = manage_callouts(thisptr, &previous_callout, options,
           parsed_pattern, cb);
       PARSED_LITERAL(c, parsed_pattern);
+      meta_quantifier = 0; 
       }
     continue;  /* Next character */
     }
@@ -2405,10 +2406,10 @@ while (ptr < ptrend)
     continue;   /* Next character in pattern */
     }
 
-  /* At the point we must process everything that must not change the
-  qualification state. This is mainly comments, but we handle \Q and \E here as
-  well, so that an item such as A\Q\E+ is treated as A+, as in Perl. An
-  isolated \E is ignored. */
+  /* Not a verb name character. At this point we must process everything that
+  must not change the quantification state. This is mainly comments, but we
+  handle \Q and \E here as well, so that an item such as A\Q\E+ is treated as
+  A+, as in Perl. An isolated \E is ignored. */
 
   if (c == CHAR_BACKSLASH && ptr < ptrend)
     {

testdata/testinput2

@@ -4931,4 +4931,8 @@ a)"xI
 //replace=0
     \=offset=7
 
+".+\QX\E+"B,no_auto_possess
+
+".+\QX\E+"B,auto_callout,no_auto_possess
+
 # End of testinput2 

testdata/testoutput2

@@ -15386,6 +15386,27 @@ Failed: error -57 at offset 2 in replacement: bad escape sequence in replacement
     \=offset=7
 Failed: error -33: bad offset value
 
+".+\QX\E+"B,no_auto_possess
+------------------------------------------------------------------
+        Bra
+        Any+
+        X+
+        Ket
+        End
+------------------------------------------------------------------
+
+".+\QX\E+"B,auto_callout,no_auto_possess
+------------------------------------------------------------------
+        Bra
+        Callout 255 0 4
+        Any+
+        Callout 255 4 4
+        X+
+        Callout 255 8 0
+        Ket
+        End
+------------------------------------------------------------------
+
 # End of testinput2 
 Error -63: PCRE2_ERROR_BADDATA (unknown error number)
 Error -62: bad serialized data