From 86d28366b1f53f56c444e5a5ccc025cd6b136b36 Mon Sep 17 00:00:00 2001
From: andreykproductengine <andreykproductengine@lindenlab.com>
Date: Wed, 20 Feb 2019 20:30:43 +0200
Subject: SL-1811 Slight chat optimization

---
 indra/llui/lllayoutstack.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

(limited to 'indra/llui/lllayoutstack.cpp')

diff --git a/indra/llui/lllayoutstack.cpp b/indra/llui/lllayoutstack.cpp
index 69246a2f57..b1ba725c2f 100644
--- a/indra/llui/lllayoutstack.cpp
+++ b/indra/llui/lllayoutstack.cpp
@@ -251,8 +251,14 @@ void LLLayoutStack::draw()
 
 	// always clip to stack itself
 	LLLocalClipRect clip(getLocalRect());
-	BOOST_FOREACH(LLLayoutPanel* panelp, mPanels)
+	for (LLLayoutPanel* panelp : mPanels)
 	{
+		if ((!panelp->getVisible() || panelp->mCollapsed)
+			&& (panelp->mVisibleAmt < 0.001f || !mAnimate))
+		{
+			// essentially invisible
+			continue;
+		}
 		// clip to layout rectangle, not bounding rectangle
 		LLRect clip_rect = panelp->getRect();
 		// scale clipping rectangle by visible amount
-- 
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