fixed EXT-3564 “Docked windows hide when clicking on sidetray tabs”,

added sidetray tab buttons panel to transient manager control list,
added right padding to the docking rect area to avoid overlapping docked IM
floaters with sidetray buttons;

--HG--
branch : product-engine

indra/newview/llimfloater.cpp

@@ -56,6 +56,7 @@
 #include "llvoicechannel.h"
 #include "lltransientfloatermgr.h"
 #include "llinventorymodel.h"
+#include "llrootview.h"
 
 
 
@@ -437,6 +438,16 @@ LLIMFloater* LLIMFloater::show(const LLUUID& session_id)
 void LLIMFloater::getAllowedRect(LLRect& rect)
 {
 	rect = gViewerWindow->getWorldViewRectRaw();
+	static S32 right_padding = 0;
+	if (right_padding == 0)
+	{
+		LLPanel* side_bar_tabs =
+				gViewerWindow->getRootView()->getChild<LLPanel> (
+						"side_bar_tabs");
+		right_padding = side_bar_tabs->getRect().getWidth();
+		LLTransientFloaterMgr::getInstance()->addControlView(side_bar_tabs);
+	}
+	rect.mRight -= right_padding;
 }
 
 void LLIMFloater::setDocked(bool docked, bool pop_on_undock)