4 files changed, 28 insertions, 5 deletions
diff --git a/indra/llui/llmultislider.cpp b/indra/llui/llmultislider.cpp
index 5cfe79267f..cd9c77585a 100644
--- a/indra/llui/llmultislider.cpp
+++ b/indra/llui/llmultislider.cpp
@@ -41,8 +41,6 @@
 
 static LLDefaultChildRegistry::Register<LLMultiSlider> r("multi_slider_bar");
 
-const F32 FLOAT_THRESHOLD = 0.00001f;
-
 S32 LLMultiSlider::mNameCounter = 0;
 
 LLMultiSlider::SliderParams::SliderParams()
@@ -54,6 +52,7 @@ LLMultiSlider::SliderParams::SliderParams()
 LLMultiSlider::Params::Params()
 :	max_sliders("max_sliders", 1),
 	allow_overlap("allow_overlap", false),
+	overlap_threshold("overlap_threshold", 0),
 	draw_track("draw_track", true),
 	use_triangle("use_triangle", false),
 	track_color("track_color"),
@@ -98,6 +97,15 @@ LLMultiSlider::LLMultiSlider(const LLMultiSlider::Params& p)
 		setMouseUpCallback(initCommitCallback(p.mouse_up_callback));
 	}
 
+    if (p.overlap_threshold.isProvided())
+    {
+        mOverlapThreshold = p.overlap_threshold;
+    }
+    else
+    {
+        mOverlapThreshold = 0;
+    }
+
 	for (LLInitParam::ParamIterator<SliderParams>::const_iterator it = p.sliders.begin();
 		it != p.sliders.end();
 		++it)
@@ -143,11 +151,14 @@ void LLMultiSlider::setSliderValue(const std::string& name, F32 value, BOOL from
 		// look at the current spot
 		// and see if anything is there
 		LLSD::map_iterator mIt = mValue.beginMap();
+		F32 threshold = mOverlapThreshold + (mIncrement / 4); // increment is our distance between points, use to eliminate round error
 		for(;mIt != mValue.endMap(); mIt++) {
 			
 			F32 testVal = (F32)mIt->second.asReal() - newValue;
-			if(testVal > -FLOAT_THRESHOLD && testVal < FLOAT_THRESHOLD &&
-				mIt->first != name) {
+			if (testVal > -threshold
+				&& testVal < threshold
+				&& mIt->first != name)
+			{
 				hit = true;
 				break;
 			}
@@ -300,11 +311,13 @@ bool LLMultiSlider::findUnusedValue(F32& initVal)
 
 		// look at the current spot
 		// and see if anything is there
+		F32 threshold = mOverlapThreshold + (mIncrement / 4);
 		LLSD::map_iterator mIt = mValue.beginMap();
 		for(;mIt != mValue.endMap(); mIt++) {
 			
 			F32 testVal = (F32)mIt->second.asReal() - initVal;
-			if(testVal > -FLOAT_THRESHOLD && testVal < FLOAT_THRESHOLD) {
+			if(testVal > -threshold && testVal < threshold)
+			{
 				hit = true;
 				break;
 			}
diff --git a/indra/llui/llmultislider.h b/indra/llui/llmultislider.h
index 0177597da2..9281b68406 100644
--- a/indra/llui/llmultislider.h
+++ b/indra/llui/llmultislider.h
@@ -50,6 +50,8 @@ public:
 						draw_track,
 						use_triangle;
 
+		Optional<F32>	overlap_threshold;
+
 		Optional<LLUIColor>	track_color,
 							thumb_disabled_color,
 							thumb_outline_color,
@@ -107,6 +109,7 @@ protected:
 
 	S32				mMaxNumSliders;
 	BOOL			mAllowOverlap;
+	F32				mOverlapThreshold;
 	BOOL			mDrawTrack;
 	BOOL			mUseTriangle;			/// hacked in toggle to use a triangle
 
diff --git a/indra/llui/llmultisliderctrl.cpp b/indra/llui/llmultisliderctrl.cpp
index a982d431b3..d2afca19b7 100644
--- a/indra/llui/llmultisliderctrl.cpp
+++ b/indra/llui/llmultisliderctrl.cpp
@@ -53,6 +53,7 @@ LLMultiSliderCtrl::Params::Params()
 	can_edit_text("can_edit_text", false),
 	max_sliders("max_sliders", 1),
 	allow_overlap("allow_overlap", false),
+	overlap_threshold("overlap_threshold", 0),
 	draw_track("draw_track", true),
 	use_triangle("use_triangle", false),
 	decimal_digits("decimal_digits", 3),
@@ -167,6 +168,10 @@ LLMultiSliderCtrl::LLMultiSliderCtrl(const LLMultiSliderCtrl::Params& p)
 	params.increment(p.increment);
 	params.max_sliders(p.max_sliders);
 	params.allow_overlap(p.allow_overlap);
+	if (p.overlap_threshold.isProvided())
+	{
+		params.overlap_threshold = p.overlap_threshold;
+	}
 	params.draw_track(p.draw_track);
 	params.use_triangle(p.use_triangle);
 	params.control_name(p.control_name);
diff --git a/indra/llui/llmultisliderctrl.h b/indra/llui/llmultisliderctrl.h
index 5c4777ebd0..507115f5e1 100644
--- a/indra/llui/llmultisliderctrl.h
+++ b/indra/llui/llmultisliderctrl.h
@@ -57,6 +57,8 @@ public:
 								draw_track,
 								use_triangle;
 
+		Optional<F32>			overlap_threshold;
+
 		Optional<LLUIColor>		text_color,
 								text_disabled_color;