Windows: Do not drop into debugger when no MAME window has focus

src/osd/modules/debugger/debugwin.cpp

@@ -235,16 +235,20 @@ void debugger_windows::debugger_update()
 	// if we're running live, do some checks
 	if (!winwindow_has_focus() && m_machine && !m_machine->debugger().cpu().is_stopped() && (m_machine->phase() == machine_phase::RUNNING))
 	{
-		// see if the interrupt key is pressed and break if it is
-		if (seq_pressed())
+		// check to see if a debugger window has focus
+		if (std::any_of(m_window_list.begin(), m_window_list.end(), [](auto const& window) { return window->has_focus(); }))
 		{
-			HWND const focuswnd = GetFocus();
+			// see if the interrupt key is pressed and break if it is
+			if (seq_pressed())
+			{
+				HWND const focuswnd = GetFocus();
 
-			m_machine->debugger().debug_break();
+				m_machine->debugger().debug_break();
 
-			// if we were focused on some window's edit box, reset it to default
-			for (auto &info : m_window_list)
-				info->restore_field(focuswnd);
+				// if we were focused on some window's edit box, reset it to default
+				for (auto& info : m_window_list)
+					info->restore_field(focuswnd);
+			}
 		}
 	}
 }

src/osd/modules/debugger/win/debugwininfo.cpp

@@ -81,6 +81,14 @@ void debugwin_info::destroy()
 	DestroyWindow(m_wnd);
 }
 
+
+bool debugwin_info::has_focus() const
+{
+	HWND focus_hwnd = GetFocus();
+	return m_wnd == focus_hwnd || IsChild(m_wnd, focus_hwnd);
+}
+
+
 bool debugwin_info::set_default_focus()
 {
 	return false;

src/osd/modules/debugger/win/debugwininfo.h

@@ -43,6 +43,7 @@ class debugwin_info : protected debugbase_info
 	void set_foreground() const { SetForegroundWindow(m_wnd); }
 	void redraw();
 	void destroy();
+	bool has_focus() const;
 
 	virtual bool set_default_focus();
 	void prev_view(debugview_info *curview);