irc: force UI refresh after local send/append; no need to reselect channel to see own messages

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

main.lua

@@ -270,6 +270,9 @@ function IrcChatView:appendLine(line, target)
         if self._ui_open and self.scroll_text_w and self.scroll_text_w.text_widget then
             self.scroll_text_w.text_widget:setText(buf)
             self.scroll_text_w:scrollToBottom()
+            if UIManager and self.frame and self.frame.dimen then
+                UIManager:setDirty(self, function() return "ui", self.frame.dimen end)
+            end
         end
     else
         -- increment unread counter for background target