v1.6.1

• Fixed: changing the font size a few times crashed the terminal. Every
  size you passed through kept its own permanent copy of the character
  set in the glyph texture, and once that texture filled up the next
  character written to it ran off the end — which the graphics driver
  treats as fatal. Only one font size is kept now, the texture is four
  times larger, and running out of room falls back to reusing it rather
  than crashing. (#1)
• Fixed: scrollback_lines did nothing. The setting was saved, shown in
  the settings panel and documented as defaulting to 5000, but the number
  never reached the terminal grid — every pane kept a fixed 10000 lines
  regardless. It now works, and changing it applies to panes that are
  already open rather than only new ones. If you never set it, panes now
  keep 5000 lines of history instead of 10000 — raise it in the settings
  panel or your config file if you want the old depth back.
• Fixed: a multi-command paste could skip the confirmation prompt. The
  check counted only line feeds, but a carriage return submits a command
  just as well, so text separated with those ran every command it
  contained without asking. Both count now, and the prompt reports the
  line count correctly for either.
• Fixed: hand-editing font_size to 0 crashed the app the moment the file
  was saved, and a negative value froze it at 100% CPU with no way back.
  Numeric settings are now clamped to their documented ranges on load —
  font_size to 6–48, transparency to 0.0–1.0, scrollback_lines to at
  most 1000000 — and say so on stderr.
• Fixed: dragging a pane divider and releasing the mouse over an open menu
  or the settings panel left the divider stuck to the pointer, resizing on
  every later mouse movement with no button held. Losing window focus
  mid-drag did the same. Text selections and mouse-driven programs had the
  same problem. All of them now end properly.
• Fixed: when a pane's shell failed to start while restoring a saved
  session, the pane stayed in the layout as a dead blank rectangle that
  could take focus and silently swallow everything typed into it. It is
  now removed, and the remaining panes take the space.
• Fixed: if a split failed to start its shell, the pane that was split kept
  a terminal sized for half the space while drawing at full width.