Reset the MOUSE_WHEEL in LocalEvent::GetClean() and LocalEvent::Handl…

…eEvents(), add a few comments regarding event modes (ihhub#6100)

src/engine/localevent.cpp

@@ -1090,12 +1090,15 @@ void LocalEvent::PauseCycling()
 LocalEvent & LocalEvent::GetClean()
 {
     LocalEvent & le = Get();
+
     le.ResetModes( KEY_PRESSED );
     le.ResetModes( MOUSE_MOTION );
     le.ResetModes( MOUSE_PRESSED );
     le.ResetModes( MOUSE_RELEASED );
     le.ResetModes( MOUSE_CLICKED );
+    le.ResetModes( MOUSE_WHEEL );
     le.ResetModes( KEY_HOLD );
+
     return le;
 }
 
@@ -1119,12 +1122,12 @@ bool LocalEvent::HandleEvents( bool delay, bool allowExit )
 
     SDL_Event event;
 
+    // We shouldn't reset the MOUSE_PRESSED and KEY_HOLD here because these are "lasting" states
+    ResetModes( KEY_PRESSED );
     ResetModes( MOUSE_MOTION );
     ResetModes( MOUSE_RELEASED );
     ResetModes( MOUSE_CLICKED );
-    ResetModes( KEY_PRESSED );
-
-    mouse_wm = fheroes2::Point();
+    ResetModes( MOUSE_WHEEL );
 
     while ( SDL_PollEvent( &event ) ) {
         switch ( event.type ) {

src/engine/localevent.h

@@ -324,13 +324,13 @@ class LocalEvent
 
     enum flag_t
     {
-        KEY_PRESSED = 0x0001,
-        MOUSE_MOTION = 0x0002,
+        KEY_PRESSED = 0x0001, // key on the keyboard has been pressed
+        MOUSE_MOTION = 0x0002, // mouse cursor has been moved
         MOUSE_PRESSED = 0x0004, // mouse button is currently pressed
         MOUSE_RELEASED = 0x0008, // mouse button has just been released
         MOUSE_CLICKED = 0x0010, // mouse button has been clicked
-        MOUSE_WHEEL = 0x0020,
-        KEY_HOLD = 0x0040
+        MOUSE_WHEEL = 0x0020, // mouse wheel has been rotated
+        KEY_HOLD = 0x0040 // key on the keyboard is currently being held down
     };
 
     void SetModes( flag_t f )