28338: keep =~ from inverting sense of subsequent tests (after &&/||)

Test/C02cond.ztst

@@ -283,6 +283,19 @@ F:Failures in these cases do not indicate a problem in the shell.
     print OK
   fi)
 0:MATCH, MBEGIN, MEND, match, mbegin, mend
+>OK
+
+  (if zmodload -i zsh/regex 2>/dev/null; then
+    if [[ a =~ a && b == b ]]; then
+      print OK
+    else
+      print "regex =~ inverted following test"
+    fi
+  else
+    # not a test error
+    print OK
+  fi)
+0:regex infix operator should not invert following conditions
 >OK
 
   [[ -fail badly ]]