fix: (sprint) drop sprint when a silent rotation diverges from movement

GrimAC's prediction only allows sprint whose movement resolves to forward=1 in the frame of the yaw sent to the server (movement within ~45 deg of the sent yaw). Scaffold/KillAura silent rotations that point off the movement direction while sprinting made every tick unpredictable and flagged. Feed the sprint controller the server-rotation-frame input again (as older builds did) and add an AntiCheatSprint guard (default on) that stops sprint whenever a server-side rotation is active and the server-frame forward drops below 1, overriding AllDirections and scaffold-controlled sprint.

Author: opZywl

src/main/java/net/ccbluex/liquidbounce/features/module/modules/movement/Sprint.kt

@@ -60,6 +60,9 @@ object Sprint : Module("Sprint", Category.MOVEMENT, Category.SubCategory.MOVEMEN
     private val noPackets by boolean("NoPackets", false) { mode == "Vanilla" }
         .describe("Do not send sprint start/stop packets.")
 
+    private val anticheatSprint by boolean("AntiCheatSprint", true)
+        .describe("Stop sprinting when a silent rotation points more than ~45 degrees off your movement; modern anticheats reject sprinting off the yaw sent to the server.")
+
     private var isSprinting = false
 
     private val generalGroup = Configurable("General")
@@ -68,7 +71,7 @@ object Sprint : Module("Sprint", Category.MOVEMENT, Category.SubCategory.MOVEMEN
     private val serverSideGroup = Configurable("ServerSide")
 
     init {
-        moveValues(generalGroup, "Mode", "OnlyOnSprintPress", "AlwaysCorrectSprint", "NoPackets")
+        moveValues(generalGroup, "Mode", "OnlyOnSprintPress", "AlwaysCorrectSprint", "NoPackets", "AntiCheatSprint")
         moveValues(directionsGroup,
             "AllDirections", "JumpDirections", "AllDirectionsLimitSpeed", "AllDirectionsLimitSpeedOnlyGround")
         moveValues(conditionsGroup, "Blindness", "UsingItem", "Inventory", "Food")
@@ -179,6 +182,16 @@ object Sprint : Module("Sprint", Category.MOVEMENT, Category.SubCategory.MOVEMEN
             return true
         }
 
+        // GrimAC's prediction only accepts sprint whose movement resolves to forward = 1 in the
+        // frame of the yaw we send. When a silent server-side rotation points more than ~45 degrees
+        // off our real movement, the server-frame forward drops below 1, so keeping sprint desyncs
+        // every tick. Drop sprint here regardless of AllDirections or scaffold-controlled sprint.
+        val silentRotationRejectsSprint = currentRotation != null &&
+            activeSettings?.applyServerSide == true && modifiedForward < 0.8f
+        if (anticheatSprint && silentRotationRejectsSprint) {
+            return true
+        }
+
         if (ignoreDirectionCheck) {
             return false
         }

src/main/java/net/ccbluex/liquidbounce/injection/forge/mixins/entity/MixinEntityPlayerSP.java

@@ -424,13 +424,10 @@ public void onLivingUpdate() {
 
         EventManager.INSTANCE.call(PostSprintUpdateEvent.INSTANCE);
 
-        final boolean modernSilentCorrection = settings != null && settings.getUseModernRotations()
-                && ("Strict".equals(settings.getModernMovementCorrection())
-                || "Silent".equals(settings.getModernMovementCorrection()));
-
-        // Silent rotation correction must not make the sprint controller interpret the remapped
-        // server-side input as the player's physical direction.
-        sprint.correctSprintState(modernSilentCorrection ? movementInput : modifiedInput, isUsingItem);
+        // Feed the sprint controller the movement expressed in the server-rotation frame
+        // (modifiedInput). GrimAC only accepts sprint within ~45 degrees of the yaw we send, so the
+        // direction guard in Sprint must evaluate the server-frame forward, not the raw camera input.
+        sprint.correctSprintState(modifiedInput, isUsingItem);
 
         if (capabilities.allowFlying) {
             if (mc.playerController.isSpectatorMode()) {