Do not keep previous state in rmioc::input

src/rmioc/input.cpp

@@ -47,11 +47,7 @@ bool input::fetch_events()
     {
         if (current_event.type == EV_SYN)
         {
-            if (!has_changes)
-            {
-                has_changes = true;
-                this->previous_slots_state = this->slots_state;
-            }
+            has_changes = true;
 
             for (const input_event& event : this->pending_events)
             {
@@ -119,9 +115,4 @@ const input::slots_state_t& input::get_slots_state() const
     return this->slots_state;
 }
 
-const input::slots_state_t& input::get_previous_slots_state() const
-{
-    return this->previous_slots_state;
-}
-
 } // namespace rmioc

src/rmioc/input.hpp

@@ -52,7 +52,6 @@ public:
     using slots_state_t = std::map<int, slot_state>;
 
     const slots_state_t& get_slots_state() const;
-    const slots_state_t& get_previous_slots_state() const;
 
 private:
     /** File descriptor for the input device. */
@@ -64,9 +63,6 @@ private:
     /** List of active touch point slots indexed by their ID. */
     slots_state_t slots_state;
 
-    /** Previous state of active touch point slots. */
-    slots_state_t previous_slots_state;
-
     /** Currently active touch point slot. */
     int current_slot = 0;
 }; // class input