add BW_RTTY_AUTO and fix rtty bandwidth setting

src/cw_rtty/rtty.cxx

@@ -25,6 +25,7 @@
 
 #include <config.h>
 #include <iostream>
+#include <algorithm>
 using namespace std;
 
 #include "view_rtty.h"
@@ -185,10 +186,13 @@ void rtty::restart()
 	symbollen = (int) (samplerate / rtty_baud + 0.5);
 	set_bandwidth(shift);
 
-	if (progdefaults.RTTY_BW < rtty_baud)
-		progdefaults.RTTY_BW = rtty_baud;
+	if (progdefaults.RTTY_BW_AUTO)
+	{
+		progdefaults.RTTY_BW = max(rtty_baud, 68.0);
+		sldrRTTYbandwidth->value(progdefaults.RTTY_BW);
+	}
+
 	rtty_BW = progdefaults.RTTY_BW;
-	sldrRTTYbandwidth->value(rtty_BW);
 
 	wf->redraw_marker();
 

src/dialogs/confdialog.cxx

@@ -1890,6 +1890,16 @@ Fl_Value_Slider2 *sldrRTTYbandwidth=(Fl_Value_Slider2 *)0;
 
 static void cb_sldrRTTYbandwidth(Fl_Value_Slider2* o, void*) {
   progdefaults.RTTY_BW = o->value();
+progdefaults.RTTY_BW_AUTO = false;
+progdefaults.changed = true;
+}
+
+Fl_Button *RTTYbandwidthAuto=(Fl_Button *)0;
+
+static void cb_RTTYbandwidthAuto(Fl_Button*, void*) {
+  progdefaults.RTTY_BW_AUTO = true;
+resetRTTY();
+progdefaults.changed = true;
 }
 
 Fl_Counter2 *selCustomShift=(Fl_Counter2 *)0;
@@ -6089,7 +6099,7 @@ an merging"));
                 o->value(progdefaults.Xagc);
                 o->hide();
               } // Fl_Check_Button* chkXagc
-              { Fl_Value_Slider2* o = sldrRTTYbandwidth = new Fl_Value_Slider2(100, 325, 300, 20, _("Receive filter bandwidth"));
+              { Fl_Value_Slider2* o = sldrRTTYbandwidth = new Fl_Value_Slider2(85, 325, 300, 20, _("Receive filter bandwidth"));
                 sldrRTTYbandwidth->tooltip(_("Adjust the DSP bandwidth"));
                 sldrRTTYbandwidth->type(1);
                 sldrRTTYbandwidth->box(FL_DOWN_BOX);
@@ -6110,6 +6120,9 @@ an merging"));
                 o->value(progdefaults.RTTY_BW);
                 o->labelsize(FL_NORMAL_SIZE); o->textsize(FL_NORMAL_SIZE);
               } // Fl_Value_Slider2* sldrRTTYbandwidth
+              { RTTYbandwidthAuto = new Fl_Button(390, 325, 65, 20, _("Auto"));
+                RTTYbandwidthAuto->callback((Fl_Callback*)cb_RTTYbandwidthAuto);
+              } // Fl_Button* RTTYbandwidthAuto
               { Fl_Counter2* o = selCustomShift = new Fl_Counter2(36, 103, 100, 20, _("Custom shift"));
                 selCustomShift->tooltip(_("Input carrier shift"));
                 selCustomShift->box(FL_UP_BOX);

src/dialogs/confdialog.fl

@@ -2458,12 +2458,21 @@ progdefaults.changed = true;}
               }
               Fl_Value_Slider sldrRTTYbandwidth {
                 label {Receive filter bandwidth}
-                callback {progdefaults.RTTY_BW = o->value();}
-                tooltip {Adjust the DSP bandwidth} xywh {100 325 300 20} type Horizontal align 5 minimum 5 maximum 1000 step 1 value 25 textsize 14
+                callback {progdefaults.RTTY_BW = o->value();
+progdefaults.RTTY_BW_AUTO = false;
+progdefaults.changed = true;}
+                tooltip {Adjust the DSP bandwidth} xywh {85 325 300 20} type Horizontal align 5 minimum 5 maximum 1000 step 1 value 25 textsize 14
                 code0 {o->value(progdefaults.RTTY_BW);}
                 code1 {o->labelsize(FL_NORMAL_SIZE); o->textsize(FL_NORMAL_SIZE);}
                 class Fl_Value_Slider2
               }
+              Fl_Button RTTYbandwidthAuto {
+                label Auto
+                callback {progdefaults.RTTY_BW_AUTO = true;
+resetRTTY();
+progdefaults.changed = true;}
+                xywh {390 325 65 20}
+              }
               Fl_Counter selCustomShift {
                 label {Custom shift}
                 callback {progdefaults.rtty_custom_shift = o->value();

src/include/confdialog.h

@@ -255,6 +255,7 @@ extern Fl_Check_Button *chkPseudoFSK;
 extern Fl_Choice *mnuRTTYAFCSpeed;
 extern Fl_Check_Button *chkXagc;
 extern Fl_Value_Slider2 *sldrRTTYbandwidth;
+extern Fl_Button *RTTYbandwidthAuto;
 extern Fl_Counter2 *selCustomShift;
 extern Fl_Group *tabTHOR;
 extern Fl_Input2 *txtTHORSecondary;

src/include/configuration.h

@@ -256,6 +256,9 @@
         ELEM_(double, RTTY_BW, "RTTYBW",                                                \
               "Receive filter bandwidth (Hz)",                                          \
               68.0)                                                                     \
+        ELEM_(bool, RTTY_BW_AUTO, "RTTYBW",                                             \
+              "Was RTTY_BW set automatically?",                                         \
+              true)                                                                     \
         ELEM_(int, rtty_baud, "RTTYBAUD",                                               \
               "Carrier baud rate. Values are as follows:\n"                             \
               "  1: 45; 1: 45.45; 2: 50; 3: 56; 4: 75; 5: 100; 6: 110; 7: 150; \n"      \