CHUI-362 ADD. FIX (When the "Bring back" panel is there, it is not possible to...

CHUI-362 ADD. FIX (When the "Bring back" panel is there, it is not possible to collapse the right side of the conversation dialog: the toolbar is completely missing and the "<<" chevrons are not there): This was because the button "<<" belonged session's floater and not the container. Therefore, when all the floaters in the stack becomes invisible, their buttons also become invisible. Solution: Added additional button "<<" in the stub_panel of the container.

indra/newview/llfloaterimcontainer.cpp

@@ -205,6 +205,8 @@ BOOL LLFloaterIMContainer::postBuild()
 
 	mExpandCollapseBtn = getChild<LLButton>("expand_collapse_btn");
 	mExpandCollapseBtn->setClickedCallback(boost::bind(&LLFloaterIMContainer::onExpandCollapseButtonClicked, this));
+	mStubCollapseBtn = getChild<LLButton>("stub_collapse_btn");
+	mStubCollapseBtn->setClickedCallback(boost::bind(&LLFloaterIMContainer::onStubCollapseButtonClicked, this));
 
 	childSetAction("add_btn", boost::bind(&LLFloaterIMContainer::onAddButtonClicked, this));
 
@@ -335,6 +337,11 @@ void LLFloaterIMContainer::onNewMessageReceived(const LLSD& data)
 	}
 }
 
+void LLFloaterIMContainer::onStubCollapseButtonClicked()
+{
+	collapseMessagesPane(true);
+}
+
 void LLFloaterIMContainer::onExpandCollapseButtonClicked()
 {
 	if (mConversationsPane->isCollapsed() && mMessagesPane->isCollapsed()

indra/newview/llfloaterimcontainer.h

@@ -109,6 +109,7 @@ class LLFloaterIMContainer
 	void onNewMessageReceived(const LLSD& data);
 
 	void onExpandCollapseButtonClicked();
+	void onStubCollapseButtonClicked();
 	void processParticipantsStyleUpdate();
 
 	void collapseConversationsPane(bool collapse);
@@ -147,6 +148,7 @@ class LLFloaterIMContainer
 	void openNearbyChat();
 
 	LLButton* mExpandCollapseBtn;
+	LLButton* mStubCollapseBtn;
 	LLPanel* mStubPanel;
 	LLTextBox* mStubTextBox;
 	LLLayoutPanel* mMessagesPane;

indra/newview/skins/default/xui/en/floater_im_container.xml

@@ -134,6 +134,19 @@
                left="0"
                height="430"
                width="412">
+                 <button
+                 follows="right|top"
+                 height="25"
+                 image_hover_unselected="Toolbar_Middle_Over"
+                 image_overlay="Conv_toolbar_collapse"
+                 image_selected="Toolbar_Middle_Selected"
+                 image_unselected="Toolbar_Middle_Off"
+                 layout="topleft"
+                 top="5"
+                 right="-10"
+                 name="stub_collapse_btn"
+                 tool_tip="Collapse this pane"
+                 width="31" />
                  <text
                    type="string"
                    clip_partial="false"
@@ -142,7 +155,7 @@
                    left="20"
                    right="-20"
                    name="stub_textbox_1"
-                   top="10"
+                   top="30"
                    height="20"
                    valign="center"
                    wrap="true">
@@ -156,7 +169,7 @@
                    left="20"
                    right="-20"
                    name="stub_textbox_2"
-                   top="40"
+                   top="60"
                    height="20"
                    valign="center"
                    parse_urls="true"