irc: preserve channels/buffers on UI reinit; avoid resetting state when reopening background session

Signed-off-by: Slendi <slendi@socopon.com>

main.lua

@@ -47,7 +47,7 @@ local IrcChatView = TextViewer:extend{
     _ui_open = false,
 }
 
-function IrcChatView:init()
+function IrcChatView:init(reinit)
     -- Buttons: Send, Close
     self.buttons_table = {
         {
@@ -66,22 +66,28 @@ function IrcChatView:init()
         }
     }
     -- Buffers & title
-    self._buffers = {}
-    self._ordered_targets = {}
-    self._current_target = nil
-    self._server_label = self._server and (self._server.name or (self._server.host .. ":" .. tostring(self._server.port or 6667))) or "IRC"
-    self._unread = {}
-    -- Init history before selecting initial buffer
-    self:initHistory()
-    -- default to server console target
-    self:switchTarget("*")
+    if not reinit then
+        self._buffers = {}
+        self._ordered_targets = {}
+        self._current_target = nil
+        self._unread = {}
+    end
+    if not self._server_label then
+        self._server_label = self._server and (self._server.name or (self._server.host .. ":" .. tostring(self._server.port or 6667))) or "IRC"
+    end
+    if not reinit then
+        -- Init history before selecting initial buffer
+        self:initHistory()
+        -- default to server console target
+        self:switchTarget("*")
+    end
     -- Restore last active target if available
     local last = self:loadLastTarget()
     if last and last ~= "" then
         self:switchTarget(last)
     end
     self:updateTitle()
-    TextViewer.init(self)
+    TextViewer.init(self, reinit)
     -- Start connection after UI init so we can show logs
     UIManager:nextTick(function() self:startConnection() end)
 end