message: Fix fullwidth char regex search infinite loop
  This resolves an issue where the regex search could loop indefinitely
  when the end point was defined in a location containing a fullwidth
  character, thus skipping over the end before termination.
  Fixes
diff: @@ -49,6 +49,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
  - Freeze when the vi cursor is on the scrollback and scrollback clear is invoked
  - Vi cursor on topmost of the display moving downward when scrolled into history with active output
  - Input lag on Wayland with Nvidia binary driver
  +- Crash when hovering the mouse over fullwidth characters
  ### Removed
  