Record whether the width or height were set manually, and refrain from changing a manually set value when the terminal size changes.

src/include/options.h

@@ -53,6 +53,8 @@ struct opts_s {           /* structure describing run-time options */
 	unsigned int average_rate_window; /* time window in seconds for average rate calculations */
 	unsigned int width;            /* screen width */
 	unsigned int height;           /* screen height */
+	bool width_set_manually;       /* width was set manually, not detected */
+	bool height_set_manually;      /* height was set manually, not detected */
 	/*@keep@*/ /*@null@*/ char *name;    /* display name, if any */
 	/*@keep@*/ /*@null@*/ char *format;  /* output format, if any */
 	/*@keep@*/ /*@null@*/ char *pidfile; /* PID file, if any */

src/include/pv-internal.h

@@ -107,6 +107,8 @@ struct pvstate_s {
 	int watch_fd;			 /* fd to watch */
 	unsigned int width;              /* screen width */
 	unsigned int height;             /* screen height */
+	bool width_set_manually;	 /* width was set manually, not detected */
+	bool height_set_manually;	 /* height was set manually, not detected */
 	/*@null@*/ char *name;		 /* display name */
 	char default_format[PV_SIZEOF_DEFAULT_FORMAT];	 /* default format string */
 	char *format_string;		 /* output format string */

src/include/pv.h

@@ -119,8 +119,8 @@ extern void pv_state_no_splice_set(pvstate_t, bool);
 extern void pv_state_discard_input_set(pvstate_t, bool);
 extern void pv_state_size_set(pvstate_t, unsigned long long);
 extern void pv_state_interval_set(pvstate_t, double);
-extern void pv_state_width_set(pvstate_t, unsigned int);
-extern void pv_state_height_set(pvstate_t, unsigned int);
+extern void pv_state_width_set(pvstate_t, unsigned int, bool);
+extern void pv_state_height_set(pvstate_t, unsigned int, bool);
 extern void pv_state_name_set(pvstate_t, /*@null@*/ const char *);
 extern void pv_state_format_string_set(pvstate_t, /*@null@*/ const char *);
 extern void pv_state_watch_pid_set(pvstate_t, unsigned int);