document 1.25 bugfix

Improved Sixel height and width, on_resize.py improved (#320)

Improve sixel size order-preference by suggested implementation from @j4james,
pexpect/ptyprocess#79 (comment)

Pixel/Window and Sixel sizes are different because there is almost always some "remainder" in the margins of a window:
<img width="298" height="276" alt="image" src="https://github.com/user-attachments/assets/5a3badef-35d0-4431-99f9-9031ece511c6" />

Sixel cannot draw in the black margin areas (smaller).

on_resize.py
------------------

The example script and surrounding documentation was improved to make this distinction clear, and, design tips on how "safely" use signal handlers as well as "de-bouncing" in our example.

Some example outputs of bin/on_resize.py:

- Konsole ``height=29, width=143, pixel_height=764, pixel_width=1574, sixel_height=754, sixel_width=1573``
- Bobcat ``height=23, width=115, pixel_height=0, pixel_width=0, sixel_height=529, sixel_width=1150``
- kitty ``height=44, width=160, pixel_height=880, pixel_width=1440, sixel_height=0, sixel_width=0`` (no sixel)
- ghostty ``height=24, width=119, pixel_height=528, pixel_width=1190, sixel_height=0, sixel_width=0`` (no sixel)

Set version for next release, 1.23 (#316)

Set version 1.22 for release (#294)

Merge pull request #275

Closes #273 by @grayjk,

> The following code enters an infinite loop:

    import blessed
    blessed.Terminal().wrap('\u5973', 1)

This PR fixes it by explicit check: when
- the given individual sequence is of length '2'
- and the wrap width is '1'
- and the cur_len is '0'

we cannot break down this "Wide" character any further -- so it is allowed to "flow outside" the given cell.

Bump version to 1.20.0

Bump version to 1.19.1

Fix metadata formatting (#220)

Add 'Typing :: Typed' classifier

Follow-up on #190, see https://pypi.org/classifiers/.

Cut version 1.18.0