Add option to disable selection hints

indra/newview/app_settings/settings.xml

@@ -16245,5 +16245,16 @@
       <key>Value</key>
       <integer>1</integer>
     </map>
+    <key>EnableSelectionHints</key>
+    <map>
+      <key>Comment</key>
+      <string>Whether or not to send editing hints to animate the arm when editing an object.</string>
+      <key>Persist</key>
+      <integer>1</integer>
+      <key>Type</key>
+      <string>Boolean</string>
+      <key>Value</key>
+      <integer>1</integer>
+    </map>
 </map>
 </llsd>

indra/newview/llhudeffectpointat.cpp

@@ -34,6 +34,7 @@
 #include "llagent.h"
 #include "llagentcamera.h"
 #include "lldrawable.h"
+#include "llviewercontrol.h"
 #include "llviewerobjectlist.h"
 #include "llvoavatar.h"
 #include "message.h"
@@ -221,6 +222,12 @@ void LLHUDEffectPointAt::setTargetPosGlobal(const LLVector3d &target_pos_global)
 //-----------------------------------------------------------------------------
 bool LLHUDEffectPointAt::setPointAt(EPointAtType target_type, LLViewerObject *object, LLVector3 position)
 {
+    static LLCachedControl<bool> enable_selection_hints(gSavedSettings, "EnableSelectionHints", true);
+    if (!enable_selection_hints)
+    {
+        return false;
+    }
+
     if (!mSourceObject)
     {
         return false;

indra/newview/llvoavatarself.cpp

@@ -2830,6 +2830,12 @@ void LLVOAvatarSelf::setHoverOffset(const LLVector3& hover_offset, bool send_upd
 //------------------------------------------------------------------------
 bool LLVOAvatarSelf::needsRenderBeam()
 {
+    static LLCachedControl<bool> enable_selection_hints(gSavedSettings, "EnableSelectionHints", true);
+    if (!enable_selection_hints)
+    {
+        return false;
+    }
+
     LLTool *tool = LLToolMgr::getInstance()->getCurrentTool();
 
     bool is_touching_or_grabbing = (tool == LLToolGrab::getInstance() && LLToolGrab::getInstance()->isEditing());