Use $BASH_COMMAND if HISTCONTROL is incompatible

When determining the command line, check if `$HISTCONTROL` is configured as expected. If not, then fall back to the built-in variable `$BASH_COMMAND` for a second-best command line.

This accounts for when the user either changes `$HISTCONTROL` after loading `bash-preexec`, or otherwise removes/disables `__bp_adjust_histcontrol`.

bash-preexec.sh

@@ -232,10 +232,12 @@ __bp_preexec_invoke_exec() {
     fi
 
     local this_command
-    this_command=$(
-        export LC_ALL=C
-        HISTTIMEFORMAT= builtin history 1 | sed '1 s/^ *[0-9][0-9]*[* ] //'
-    )
+	if [[ "$HISTCONTROL" == *ignore+(dups|space)* ]]
+	then
+		this_command="${BASH_COMMAND:-}"
+	else
+		this_command=$( LC_ALL=C HISTTIMEFORMAT= builtin history 1 | sed '1 s/^ *[0-9][0-9]*[* ] //' )
+	fi
 
     # Sanity check to make sure we have something to invoke our function with.
     if [[ -z "$this_command" ]]; then