Do not handle any UI inputs immediately after state load/save

Before this change, if you try to save state to a bound which already
does something as a UI button, it will save state there and then
immediately execute the bound action (sometimes it would not happen).
So, if you have state to P, with default button it would pause the game
immediately after saving state (except sometimes it would not).

src/emu/ui/ui.cpp

@@ -1755,6 +1755,9 @@ UINT32 ui_manager::handler_load_save(running_machine &machine, render_container
 		machine.schedule_load(filename);
 	}
 
+	// avoid handling the name of the save state slot as a seperate input
+	machine.ui_input().mark_all_as_pressed();
+
 	// remove the pause and reset the state
 	machine.resume();
 	return UI_HANDLER_CANCEL;

src/emu/uiinput.cpp

@@ -324,3 +324,13 @@ void ui_input_manager::push_char_event(render_target* target, unicode_char ch)
 	event.ch = ch;
 	push_event(event);
 }
+
+/*-------------------------------------------------
+    mark_all_as_pressed - marks all buttons
+    as if they were already pressed once
+-------------------------------------------------*/
+void ui_input_manager::mark_all_as_pressed()
+{
+	for (int code = IPT_UI_FIRST + 1; code < IPT_UI_LAST; code++)
+		m_next_repeat[code] = osd_ticks();
+}

src/emu/uiinput.h

@@ -86,6 +86,8 @@ public:
 	void push_mouse_double_click_event(render_target* target, INT32 x, INT32 y);
 	void push_char_event(render_target* target, unicode_char ch);
 
+	void mark_all_as_pressed();
+
 private:
 
 	// internal state