v0.2.69

• Scrolling no longer drags the whole window. After switching to another app
  and coming back, a wheel or trackpad gesture over a terminal pane moved the
  titlebar and sidebar instead of the pane, and only a restart brought
  scrolling back.
• xterm consumes a wheel event in two places — its own scrollback viewport and
  the mouse-report listener it binds when the app enables wheel tracking — and
  its generic handler does nothing for a buffer that has scrollback. When both
  of those declined the same event, nothing cancelled it, so it left the pane
  and landed on #tabbody, which was scrollable.
• The document itself is never a scroller now, and a terminal route fills
  #tabbody exactly, so the only scroller inside a pane is the xterm viewport.
• A pane-level guard consumes any wheel xterm did not take and applies it to
  the buffer, so scrolling still works when xterm's viewport has stopped
  following it. The configured sensitivity of 3 is unchanged, so trackpad
  scrolling feels exactly as it did in v0.2.68.