Use native preview scroll of fzf 0.22.0

This allows you to scroll upwards

Fix #1053
Fix #751
Fix #749

bin/preview.sh

@@ -39,23 +39,9 @@ if [ -z "$CENTER" ]; then
   CENTER=0
 fi
 
-if [ -n "$FZF_PREVIEW_LINES" ]; then
-  LINES=$FZF_PREVIEW_LINES
-else
-  if [ -r /dev/tty ]; then
-    LINES=$(stty size < /dev/tty | awk '{print $1}')
-  else
-    LINES=40
-  fi
-fi
-
-FIRST=$(($CENTER-$LINES/3))
-FIRST=$(($FIRST < 1 ? 1 : $FIRST))
-LAST=$((${FIRST}+${LINES}-1))
-
 if [ -z "$FZF_PREVIEW_COMMAND" ] && command -v bat > /dev/null; then
   bat --style="${BAT_STYLE:-numbers}" --color=always --pager=never \
-      --line-range=$FIRST:$LAST --highlight-line=$CENTER "$FILE"
+      --highlight-line=$CENTER "$FILE"
   exit $?
 fi
 
@@ -63,7 +49,7 @@ DEFAULT_COMMAND="highlight -O ansi -l {} || coderay {} || rougify {} || cat {}"
 CMD=${FZF_PREVIEW_COMMAND:-$DEFAULT_COMMAND}
 CMD=${CMD//{\}/$(printf %q "$FILE")}
 
-eval "$CMD" 2> /dev/null | awk "NR >= $FIRST && NR <= $LAST { \
+eval "$CMD" 2> /dev/null | awk "{ \
     if (NR == $CENTER) \
         { gsub(/\x1b[[0-9;]*m/, \"&$REVERSE\"); printf(\"$REVERSE%s\n$RESET\", \$0); } \
     else printf(\"$RESET%s\n\", \$0); \