4 files changed, 43 insertions, 15 deletions
diff --git a/indra/newview/llenvironment.cpp b/indra/newview/llenvironment.cpp
index 20021fb075..d8095ad2ce 100644
--- a/indra/newview/llenvironment.cpp
+++ b/indra/newview/llenvironment.cpp
@@ -364,6 +364,7 @@ void LLEnvironment::initSingleton()
 
     //TODO: This frequently results in one more request than we need.  It isn't breaking, but should be nicer.
     // We need to know new env version to fix this, without it we can only do full re-request
+    // Happens: on updates, on opening LLFloaterRegionInfo, on region crossing if info floater is open
     LLRegionInfoModel::instance().setUpdateCallback([this]() { requestRegion(); });
     gAgent.addRegionChangedCallback([this]() { onRegionChange(); });
 
diff --git a/indra/newview/llfloaterregioninfo.cpp b/indra/newview/llfloaterregioninfo.cpp
index d7d114ca41..fcaa7d2bf9 100644
--- a/indra/newview/llfloaterregioninfo.cpp
+++ b/indra/newview/llfloaterregioninfo.cpp
@@ -226,7 +226,8 @@ LLUUID LLFloaterRegionInfo::sRequestInvoice;
 
 LLFloaterRegionInfo::LLFloaterRegionInfo(const LLSD& seed)
 	: LLFloater(seed),
-    mEnvironmentPanel(NULL)
+    mEnvironmentPanel(NULL),
+    mRegionChangedCallback()
 {}
 
 BOOL LLFloaterRegionInfo::postBuild()
@@ -285,13 +286,18 @@ BOOL LLFloaterRegionInfo::postBuild()
 		&processEstateOwnerRequest);
 
 	// Request region info when agent region changes.
-	gAgent.addRegionChangedCallback(boost::bind(&LLFloaterRegionInfo::requestRegionInfo, this));
+	mRegionChangedCallback = gAgent.addRegionChangedCallback(boost::bind(&LLFloaterRegionInfo::onRegionChanged, this));
 
 	return TRUE;
 }
 
 LLFloaterRegionInfo::~LLFloaterRegionInfo()
-{}
+{
+    if (mRegionChangedCallback.connected())
+    {
+        mRegionChangedCallback.disconnect();
+    }
+}
 
 void LLFloaterRegionInfo::onOpen(const LLSD& key)
 {
@@ -304,15 +310,24 @@ void LLFloaterRegionInfo::onOpen(const LLSD& key)
 	requestMeshRezInfo();
 }
 
-// static
-void LLFloaterRegionInfo::requestRegionInfo()
+void LLFloaterRegionInfo::onRegionChanged()
 {
-	LLTabContainer* tab = getChild<LLTabContainer>("region_panels");
+    if (getVisible()) //otherwise onOpen will do request
+    {
+        requestRegionInfo();
+    }
+}
 
-	tab->getChild<LLPanel>("General")->setCtrlsEnabled(FALSE);
-	tab->getChild<LLPanel>("Debug")->setCtrlsEnabled(FALSE);
-	tab->getChild<LLPanel>("Terrain")->setCtrlsEnabled(FALSE);
-	tab->getChild<LLPanel>("Estate")->setCtrlsEnabled(FALSE);
+void LLFloaterRegionInfo::requestRegionInfo()
+{
+	LLTabContainer* tab = findChild<LLTabContainer>("region_panels");
+	if (tab)
+	{
+		tab->getChild<LLPanel>("General")->setCtrlsEnabled(FALSE);
+		tab->getChild<LLPanel>("Debug")->setCtrlsEnabled(FALSE);
+		tab->getChild<LLPanel>("Terrain")->setCtrlsEnabled(FALSE);
+		tab->getChild<LLPanel>("Estate")->setCtrlsEnabled(FALSE);
+	}
 
 	// Must allow anyone to request the RegionInfo data
 	// so non-owners/non-gods can see the values. 
@@ -483,9 +498,12 @@ void LLFloaterRegionInfo::processRegionInfo(LLMessageSystem* msg)
 
 	panel->setCtrlsEnabled(allow_modify);
 
-	// Note: region info also causes LLRegionInfoModel::instance().update(msg); -> requestRegion(); -> changed message
-	// we need to know env version here and in update(msg) to know when to request and when not to, when to filter 'changed'
-	floater->refreshFromRegion( gAgent.getRegion() );
+	if (floater->getVisible())
+	{
+		// Note: region info also causes LLRegionInfoModel::instance().update(msg); -> requestRegion(); -> changed message
+		// we need to know env version here and in update(msg) to know when to request and when not to, when to filter 'changed'
+		floater->refreshFromRegion(gAgent.getRegion());
+	} // else will rerequest on onOpen either way
 }
 
 // static
diff --git a/indra/newview/llfloaterregioninfo.h b/indra/newview/llfloaterregioninfo.h
index 6d64ae1d60..0566c4b2ce 100644
--- a/indra/newview/llfloaterregioninfo.h
+++ b/indra/newview/llfloaterregioninfo.h
@@ -96,6 +96,7 @@ public:
 	// from LLPanel
 	virtual void refresh();
 	
+	void onRegionChanged();
 	void requestRegionInfo();
 	void requestMeshRezInfo();
 	void enableTopButtons();
@@ -120,6 +121,8 @@ protected:
     LLPanelRegionEnvironment *mEnvironmentPanel;
 	//static S32 sRequestSerial;	// serial # of last EstateOwnerRequest
 	static LLUUID sRequestInvoice;
+private:
+    boost::signals2::connection mRegionChangedCallback;
 };
 
 
diff --git a/indra/newview/llpanelenvironment.cpp b/indra/newview/llpanelenvironment.cpp
index 04f281a40c..7abb05b6fb 100644
--- a/indra/newview/llpanelenvironment.cpp
+++ b/indra/newview/llpanelenvironment.cpp
@@ -255,13 +255,19 @@ void LLPanelEnvironmentInfo::refresh()
     LLEnvironment::altitude_list_t altitudes = LLEnvironment::instance().getRegionAltitudes();
     if (altitudes.size() > 0)
     {
+        LLMultiSliderCtrl *sld = getChild<LLMultiSliderCtrl>(SLD_ALTITUDES);
+        sld->clear();
+
         for (S32 idx = 0; idx < ALTITUDE_SLIDER_COUNT; ++idx)
         {
-            LLMultiSliderCtrl *sld = getChild<LLMultiSliderCtrl>(SLD_ALTITUDES);
-            sld->setSliderValue(alt_sliders[idx], altitudes[idx+1], FALSE);
+            sld->addSlider(altitudes[idx + 1], alt_sliders[idx]);
             updateAltLabel(alt_labels[idx], idx + 2, altitudes[idx+1]);
             mAltitudes[alt_sliders[idx]] = AltitudeData(idx+1, idx, altitudes[idx+1]);
         }
+        if (sld->getCurNumSliders() != ALTITUDE_SLIDER_COUNT)
+        {
+            LL_WARNS("ENVPANEL") << "Failed to add altitude sliders!" << LL_ENDL;
+        }
         readjustAltLabels();
     }