4 files changed, 23 insertions, 1 deletions
diff --git a/indra/newview/llfolderview.cpp b/indra/newview/llfolderview.cpp
index 23f19a38a6..f7fd7bb472 100644
--- a/indra/newview/llfolderview.cpp
+++ b/indra/newview/llfolderview.cpp
@@ -179,6 +179,7 @@ LLFolderView::LLFolderView(const Params& p)
 	mSourceID(p.task_id),
 	mRenameItem( NULL ),
 	mNeedsScroll( FALSE ),
+	mEnableScroll( true ),
 	mPinningSelectedItem(FALSE),
 	mNeedsAutoSelect( FALSE ),
 	mAutoSelectOverride(FALSE),
@@ -1913,7 +1914,7 @@ void LLFolderView::deleteAllChildren()
 
 void LLFolderView::scrollToShowSelection()
 {
-	if (mSelectedItems.size())
+	if (mEnableScroll && mSelectedItems.size())
 	{
 		mNeedsScroll = TRUE;
 	}
diff --git a/indra/newview/llfolderview.h b/indra/newview/llfolderview.h
index faf6a9cf23..38255b3cea 100644
--- a/indra/newview/llfolderview.h
+++ b/indra/newview/llfolderview.h
@@ -269,6 +269,7 @@ public:
 	void dumpSelectionInformation();
 
 	virtual S32	notify(const LLSD& info) ;
+	void setEnableScroll(bool enable_scroll) { mEnableScroll = enable_scroll; }
 	
 private:
 	void updateRenamerPosition();
@@ -300,6 +301,7 @@ protected:
 	LLLineEditor*					mRenamer;
 
 	BOOL							mNeedsScroll;
+	bool							mEnableScroll;
 	BOOL							mPinningSelectedItem;
 	LLRect							mScrollConstraintRect;
 	BOOL							mNeedsAutoSelect;
diff --git a/indra/newview/llinventorypanel.cpp b/indra/newview/llinventorypanel.cpp
index 048ed10886..8097985ade 100644
--- a/indra/newview/llinventorypanel.cpp
+++ b/indra/newview/llinventorypanel.cpp
@@ -681,6 +681,21 @@ BOOL LLInventoryPanel::handleDragAndDrop(S32 x, S32 y, MASK mask, BOOL drop,
 	return handled;
 }
 
+// virtual
+void LLInventoryPanel::onMouseEnter(S32 x, S32 y, MASK mask)
+{
+	LLPanel::onMouseEnter(x, y, mask);
+	// don't auto-scroll a list when cursor is over Inventory. See EXT-3981.
+	mFolders->setEnableScroll(false);
+}
+
+// virtual
+void LLInventoryPanel::onMouseLeave(S32 x, S32 y, MASK mask)
+{
+	LLPanel::onMouseLeave(x, y, mask);
+	mFolders->setEnableScroll(true);
+}
+
 void LLInventoryPanel::onFocusLost()
 {
 	// inventory no longer handles cut/copy/paste/delete
diff --git a/indra/newview/llinventorypanel.h b/indra/newview/llinventorypanel.h
index f312b588b9..37b03dbd7d 100644
--- a/indra/newview/llinventorypanel.h
+++ b/indra/newview/llinventorypanel.h
@@ -122,6 +122,10 @@ public:
 								   void* cargo_data,
 								   EAcceptance* accept,
 								   std::string& tooltip_msg);
+
+	void onMouseEnter(S32 x, S32 y, MASK mask);
+	void onMouseLeave(S32 x, S32 y, MASK mask);
+
 	// LLUICtrl methods
 	 /*virtual*/ void onFocusLost();
 	 /*virtual*/ void onFocusReceived();