NUchat 1.6.0

Added

• Network display names — networks can carry a custom label shown in the
  sidebar instead of the raw hostname.
• Collapsible sidebar for more chat room on small windows.
• Notification rate limiting — desktop balloons and sounds are throttled
  so a busy channel can't spam the system tray.
• Auto-focus message input on channel switch and window activation —
  typing anywhere goes straight to the input bar.
• hexchat.hook_unload() support in the Python scripting API.
• Expanded HexChat import (more of servlist.conf / identity settings carried
  over).
• Regression tests for IRCv3 message-tag parsing.

Fixed

• Scrollback no longer appears twice when joining a channel that has
  existing log history (the log was loaded once by the join handler and again
  by the scrollback loader).
• Crash-prone plugin/script wiring — the raw-line hook for plugins and
  scripts captured a dangling reference to the connection object (undefined
  behavior on every received line).
• DCC receive hardening — offers with an invalid (zero/negative) file size
  are rejected, and a transfer is aborted if the peer sends more data than it
  offered, so a malicious sender can no longer fill the disk.
• Private messages and CTCPs addressed with different nick casing (e.g.
  MyNick vs mynick) now route to the correct query tab instead of opening
  a bogus channel tab.
• IRCv3 message-tag values are now unescaped in a single left-to-right
  pass per spec (\\s no longer double-decodes; invalid escapes and trailing
  backslashes handled per spec).
• Server passwords containing spaces now work (PASS is colon-framed).
• /NOTIFY -nick removal is now case-insensitive, matching the add check.
• Channel-mode prefix tracking — parametered channel modes (+b/+e/+I/+k
  always, +l/+f/+j when setting) now keep the mode-parameter index aligned,
  so op/voice prefix updates no longer mis-align after mixed mode strings.
• Lag meter — only a genuine PONG …LAG<id> reply is accepted (chat text
  mentioning PONG/LAG no longer skews the measurement), and the meter stops
  based on live connections rather than open tabs.
• /SYSINFO no longer leaves a stray child process behind if a probe command
  hangs.
• Reconnecting the same connection object with a different SSL mode no longer
  risks sending registration before the TLS handshake completes.
• Focus-stealing fixed: the chat area no longer grabs keyboard focus on
  scroll.
• PM/query right-click context menus target the correct user; QML load error
  in the nick context menu fixed.
• DCC send, multi-server reconnect, and highlight fixes from the 1.5.x code
  review follow-up.
• Null-safety fixes on application exit.