CHUI-822 FIXED Resizing conversation floater with conversation list minimized...

CHUI-822 FIXED Resizing conversation floater with conversation list minimized to icons sets to fixed width that cannot be reduced : set resize limits to conv.panel's minDim() when conv. panel is collapsed

indra/newview/llfloaterimcontainer.cpp

@@ -759,7 +759,7 @@ void LLFloaterIMContainer::assignResizeLimits()
     S32 number_of_visible_borders = llmin((is_conv_pane_expanded? 2 : 0) + (is_msg_pane_expanded? 2 : 0), 3);
     S32 summary_width_of_visible_borders = number_of_visible_borders * LLPANEL_BORDER_WIDTH;
 	S32 conv_pane_current_width = is_msg_pane_expanded
-			? mConversationsPane->getRect().getWidth()
+			? (is_conv_pane_expanded? mConversationsPane->getRect().getWidth() : mConversationsPane->getMinDim())
 			: (is_conv_pane_expanded? mConversationsPane->getExpandedMinDim() : mConversationsPane->getMinDim());
 	S32 msg_pane_min_width  = is_msg_pane_expanded ? mMessagesPane->getExpandedMinDim() : 0;
 	S32 new_min_width = conv_pane_current_width + msg_pane_min_width + summary_width_of_visible_borders;