Ability to change default behavior of Chats being torn off so that all chats appear minimized upon opening, as well, regardless of conditions.

Adds debug setting OtherChatsTornOffAndMinimized
Not added to ui xml because the default behavior is likely fine.

indra/newview/app_settings/settings.xml

@@ -760,6 +760,17 @@ Found in Advanced->Rendering->Info Displays</string>
       <key>Value</key>
       <integer>0</integer>
     </map>
+    <key>OtherChatsTornOffAndMinimized</key>
+    <map>
+      <key>Comment</key>
+	  <string>When this and OtherChatsTornOff are true, new chats open torn off and minimized.</string>
+      <key>Persist</key>
+      <integer>1</integer>
+      <key>Type</key>
+      <string>Boolean</string>
+      <key>Value</key>
+      <integer>0</integer>
+    </map>
     <key>MarketImporterUpdateFreq</key>
     <map>
       <key>Comment</key>

indra/newview/llimview.cpp

@@ -1176,11 +1176,16 @@ LLFloaterIMPanel* LLIMMgr::createFloater(
 		gFloaterView->addChild(floater); // reparent to floater view
 		LLFloater* focused_floater = gFloaterView->getFocusedFloater(); // obtain the focused floater
 		floater->open(); // make the new chat floater appear
+		static LLCachedControl<bool> minimize("OtherChatsTornOffAndMinimized");
 		if (focused_floater != NULL) // there was a focused floater
 		{
 			floater->setMinimized(true); // so minimize this one, for now
 			focused_floater->setFocus(true); // and work around focus being removed by focusing on the last
 		}
+		else if (minimize)
+		{
+			floater->setMinimized(true);
+		}
 	}
 	mFloaters.insert(floater->getHandle());
 	return floater;