Qt support for changing 'statuslines' dynamically

Turns out it was nearly as simple as I originally thought.
I just missed one significant detail the first time around.
This leaves DYNAMIC_STATUSLINES as conditionl but now enables
it by default.  Using 'O' to change 'statuslines' from 2 to 3
or vice versa now works for Qt as well as for curses and tty.

win/Qt/qt_bind.cpp

@@ -834,10 +834,11 @@ void NetHackQtBind::qt_outrip(winid wid, int how, time_t when)
 
 void NetHackQtBind::qt_preference_update(const char *optname)
 {
-#ifdef DYNAMIC_STATUSLINES  // leave disabled; redoStatus() doesn't work
+#ifdef DYNAMIC_STATUSLINES  // defined in qt_main.h
     if (!strcmp(optname, "statuslines")) {
         // delete and recreate status window
-        main->redoStatus();
+        // to toggle statuslines from 2 to 3 or vice versa
+        id_to_window[WIN_STATUS] = main->redoStatus();
     }
 #else
     nhUse(optname);

win/Qt/qt_main.cpp

@@ -1180,14 +1180,14 @@ void NetHackQtMainWindow::layout()
     }
 }
 
-#ifdef DYNAMIC_STATUSLINES  // leave disabled; this doesn't work as intended
+#ifdef DYNAMIC_STATUSLINES
 // called when 'statuslines' changes from 2 to 3 or vice versa; simpler to
 // destroy and recreate the status window than to adjust existing fields
-void NetHackQtMainWindow::redoStatus()
+NetHackQtWindow *NetHackQtMainWindow::redoStatus()
 {
     NetHackQtStatusWindow *oldstatus = this->status;
     if (!oldstatus)
-        return; // not ready yet?
+        return NULL; // not ready yet?
     this->status = new NetHackQtStatusWindow;
 
     if (!qt_compact_mode)
@@ -1195,6 +1195,8 @@ void NetHackQtMainWindow::redoStatus()
 
     delete oldstatus;
     ShowIfReady();
+
+    return (NetHackQtWindow *) this->status;
 }
 #endif
 

win/Qt/qt_main.h

@@ -14,6 +14,11 @@
 #include "qt_kde0.h"
 #endif
 
+// Allow changing 'statuslines:2' to 'statuslines:3' or vice versa
+// while the game is running; deletes and re-creates the status window.
+// [Used in qt_bind.cpp and qt_main.cpp, but not referenced in qt_stat.cpp.]
+#define DYNAMIC_STATUSLINES
+
 namespace nethack_qt_ {
 
 class NetHackQtInvUsageWindow;
@@ -54,7 +59,7 @@ public:
         void resizePaperDoll(bool); // ENHANCED_PAPERDOLL
 #ifdef DYNAMIC_STATUSLINES
         // called when 'statuslines' option has been changed
-        void redoStatus();
+        NetHackQtWindow *redoStatus();
 #endif
 
 public slots: