SL-10141 FIXED [EEP] Neighboring sky levels may be closer than 100 meters to each other in edit mode

indra/llui/llmultislider.cpp

@@ -113,9 +113,9 @@ LLMultiSlider::LLMultiSlider(const LLMultiSlider::Params& p)
 		setMouseUpCallback(initCommitCallback(p.mouse_up_callback));
 	}
 
-    if (p.overlap_threshold.isProvided())
+	if (p.overlap_threshold.isProvided() && p.overlap_threshold > mIncrement)
     {
-        mOverlapThreshold = p.overlap_threshold;
+        mOverlapThreshold = p.overlap_threshold - mIncrement;
     }
     else
     {

indra/newview/skins/default/xui/en/panel_region_environment.xml

@@ -252,6 +252,7 @@
                     width="17"
                     orientation="vertical"
                     increment="10"
+                    overlap_threshold="100"
                     min_val="100"
                     max_val="4000"
                     layout="topleft"