Fix CItem::ActivateWhenAtRest() conflicting HL2MP FallThink

Author: Blixibon

src/game/server/item_world.cpp

@@ -248,8 +248,13 @@ void CItem::ActivateWhenAtRest( float flTime /* = 0.5f */ )
 {
 	RemoveSolidFlags( FSOLID_TRIGGER );
 	m_bActivateWhenAtRest = true;
+#if defined( HL2MP ) && defined( MAPBASE_MP )
+	// HL2 entities (e.g. item_item_crate) often use ActivateWhenAtRest() before spawn, which is overridden by FallThink() in MP
+	SetContextThink( &CItem::ComeToRest, gpGlobals->curtime + flTime, "ComeToRestThink" );
+#else
 	SetThink( &CItem::ComeToRest );
 	SetNextThink( gpGlobals->curtime + flTime );
+#endif
 }
 
 
@@ -266,8 +271,12 @@ void CItem::OnEntityEvent( EntityEvent_t event, void *pEventData )
 		{
 			// Delay rest for a sec, to avoid changing collision 
 			// properties inside a collision callback.
+#if defined( HL2MP ) && defined( MAPBASE_MP )
+			SetContextThink( &CItem::ComeToRest, gpGlobals->curtime + 0.1f, "ComeToRestThink" );
+#else
 			SetThink( &CItem::ComeToRest );
 			SetNextThink( gpGlobals->curtime + 0.1f );
+#endif
 		}
 		break;
 	}
@@ -283,7 +292,11 @@ void CItem::ComeToRest( void )
 	{
 		m_bActivateWhenAtRest = false;
 		AddSolidFlags( FSOLID_TRIGGER );
+#if defined( HL2MP ) && defined( MAPBASE_MP )
+		SetContextThink( NULL, TICK_NEVER_THINK, "ComeToRestThink" );
+#else
 		SetThink( NULL );
+#endif
 	}
 }