Add command to toggle hide .dot files

Patch written by Richard Hyde and taken from
https://github.com/RichardHyde/noice

config.def.h

@@ -56,6 +56,8 @@ struct key bindings[] = {
 	{ '$',            SEL_END },
 	/* Change dir */
 	{ 'c',            SEL_CD },
+	/* Toggle hide .dot files */
+	{ '.',            SEL_TOGGLEDOT },
 	/* Toggle sort by time */
 	{ 't',            SEL_MTIME },
 	{ CONTROL('L'),   SEL_REDRAW },

noice.1

@@ -49,6 +49,8 @@ Back up one directory level.
 Change filter (see below for more information).
 .It Ic c
 Change into the given directory.
+.It Ic \&.
+Toggle hide .dot files.
 .It Ic t
 Toggle sort by time modified.
 .It Ic C-l

noice.c

@@ -57,6 +57,7 @@ enum action {
 	SEL_HOME,
 	SEL_END,
 	SEL_CD,
+	SEL_TOGGLEDOT,
 	SEL_MTIME,
 	SEL_REDRAW,
 	SEL_RUN,
@@ -706,6 +707,12 @@ nochange:
 			strlcpy(fltr, ifilter, sizeof(fltr))
 			DPRINTF_S(path);
 			goto begin;
+		case SEL_TOGGLEDOT:
+			if (strcmp(fltr, ifilter) != 0)
+				strlcpy(fltr, ifilter, sizeof(fltr));
+			else
+				strlcpy(fltr, ".", sizeof(fltr));
+			goto begin;
 		case SEL_MTIME:
 			mtimeorder = !mtimeorder;
 			/* Save current */