jzombie / term-wm-vt100 / 31289711844

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feat: Support for DECAWM (the DEC auto-wrap mode toggle) (#6)

* Implement DECAWM

* Update CI workflow

* Fix DECAWM wide-character handling at the right margin

When autowrap (DECAWM) is disabled, writing a wide character at the
last column indexed column `cols` in the continuation-cell path,
returning `None` and panicking on `.unwrap()`. Writing one at `cols-2`
also let the cursor overshoot to the pending-wrap column, which the
next write clamped back, clobbering the continuation cell.

Pre-clamp the start column to `cols - width` when autowrap is disabled
and use a clamped column increment in the wide-character path, so wide
glyphs stay strictly inside the row. Add regression tests covering both
margin cases.

Also apply rustfmt across examples and tests.

* Resolve Clippy warnings

* Include README example as a doctest

* cargo sort --workspace

* Remove non-utilized dependency

* Patch license with later fork copyright

* Prepare for v0.16.2-patch2

* Implement IRM insert mode (`CSI 4 h/l`) to fix mid-line overtyping

Add Insert/Replace Mode support so a printable written at the cursor
shifts the rest of the row right instead of overwriting the existing
cell. Editors like pico/nano use `CSI 4h ... CSI 4l` to insert
characters
into the middle of a line; without it the inserted character clobbers
the
existing text — the "types over existing characters on a wrapped line"
bug. Non-private `CSI h/l` previously fell through as unhandled.

- src/perform.rs: route non-private `CSI h`/`l` to new sm/rm handlers
- src/screen.rs: add MODE_INSERT bit; sm/rm handle param 4 (IRM);
  text() shifts the row right via insert_cells(1) while insert mode is
  on
- tests: insert_mode_shifts_row_right, no_insert_mode_overwrites;
  rework decawn_toggle_resets_pending_wrap to prove pending-wrap via
  wrap
  behavior instead of cursor_position()

Also swap the `nix` termios dev-dependency for `crossterm` so the
real-terminal compare example enters/leaves raw mode cross-pl... (continued)

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