2 files changed, 26 insertions, 10 deletions

diff --git a/indra/newview/llfloatereditextdaycycle.cpp b/indra/newview/llfloatereditextdaycycle.cpp
index f712901795..a64a3d46ff 100644
--- a/indra/newview/llfloatereditextdaycycle.cpp
+++ b/indra/newview/llfloatereditextdaycycle.cpp
@@ -1373,7 +1373,7 @@ void LLFloaterEditExtDayCycle::updateTimeAndLabel()
     // Update blender here:
 }
 
-void LLFloaterEditExtDayCycle::addSliderFrame(const F32 frame, const LLSettingsBase::ptr_t &setting, bool update_ui)
+void LLFloaterEditExtDayCycle::addSliderFrame(F32 frame, const LLSettingsBase::ptr_t &setting, bool update_ui)
 {
     // multi slider distinguishes elements by key/name in string format
     // store names to map to be able to recall dependencies
@@ -1413,6 +1413,19 @@ void LLFloaterEditExtDayCycle::removeCurrentSliderFrame()
     updateTabs();
 }
 
+void LLFloaterEditExtDayCycle::removeSliderFrame(F32 frame)
+{
+    keymap_t::iterator it = std::find_if(mSliderKeyMap.begin(), mSliderKeyMap.end(), 
+        [frame](const keymap_t::value_type &value) { return fabs(value.second.mFrame - frame) < LLSettingsDay::DEFAULT_FRAME_SLOP_FACTOR; });
+
+    if (it != mSliderKeyMap.end())
+    {
+        mFramesSlider->deleteSlider((*it).first);
+        mSliderKeyMap.erase(it);
+    }
+
+}
+
 //-------------------------------------------------------------------------
 
 LLFloaterEditExtDayCycle::connection_t LLFloaterEditExtDayCycle::setEditCommitSignal(LLFloaterEditExtDayCycle::edit_commit_signal_t::slot_type cb)
@@ -2002,18 +2015,20 @@ void LLFloaterEditExtDayCycle::onAssetLoadedForInsertion(LLUUID item_id, LLUUID
         }
         else
         {
-            // load single frame
-
-            if ((mEditDay->getSettingsNearKeyframe(frame, dest_track, LLSettingsDay::DEFAULT_FRAME_SLOP_FACTOR)).second)
-            {
-                LL_WARNS("ENVDAYEDIT") << "Attempt to add new frame too close to existing frame." << LL_ENDL;
-                return;
-            }
             if (!mFramesSlider->canAddSliders())
             {
                 LL_WARNS("ENVDAYEDIT") << "Attempt to add new frame when slider is full." << LL_ENDL;
                 return;
             }
+
+            // load or replace single frame
+            LLSettingsDay::CycleTrack_t::value_type nearest = mEditDay->getSettingsNearKeyframe(frame, dest_track, LLSettingsDay::DEFAULT_FRAME_SLOP_FACTOR);
+            if (nearest.first != LLSettingsDay::INVALID_TRACKPOS)
+            {   // There is already a frame near the target location. Remove it so we can put the new one in its place.
+                mEditDay->removeTrackKeyframe(dest_track, nearest.first);
+                removeSliderFrame(nearest.first);
+            }
+
             // Don't forget to clone (we might reuse/load it couple times)
             if (settings->getSettingsType() == "sky")
             {
diff --git a/indra/newview/llfloatereditextdaycycle.h b/indra/newview/llfloatereditextdaycycle.h
index 311bbd52dc..c271f15840 100644
--- a/indra/newview/llfloatereditextdaycycle.h
+++ b/indra/newview/llfloatereditextdaycycle.h
@@ -144,8 +144,9 @@ private:
 	void                        updateLabels();
 	void                        updateSlider(); //generate sliders from current track
 	void                        updateTimeAndLabel();
-	void                        addSliderFrame(const F32 frame, const LLSettingsBase::ptr_t &setting, bool update_ui = true);
-	void                        removeCurrentSliderFrame();
+	void                        addSliderFrame(F32 frame, const LLSettingsBase::ptr_t &setting, bool update_ui = true);
+    void                        removeCurrentSliderFrame();
+    void                        removeSliderFrame(F32 frame);
 
     void                        loadInventoryItem(const LLUUID  &inventoryId);
     void                        onAssetLoaded(LLUUID asset_id, LLSettingsBase::ptr_t settings, S32 status);