vendor/dialog: upgrade from 1.3-20200327 to 1.3-20220728

Summary of notable changes:

+ initialize color-settings before --create-rc option is processed.
+ adjust fallback bindings for backspace/d

vendor/dialog: upgrade from 1.3-20200327 to 1.3-20220728

Summary of notable changes:

+ initialize color-settings before --create-rc option is processed.
+ adjust fallback bindings for backspace/delete to match the curses
library's sense of backspace (Arch #74379).
+ improve logic for updating form-height after screen-resizing.
+ correct off-by-one limit for month when validating parameters of the
calendar widget (patch by "viverna", Debian #1000720).
+ use mktemp utility rather than tempfile for temporary filename in
the sample scripts (patch by Ville Skyttä).
+ directly include stddef.h for systems which need it for offsetof().
+ fix a few cppcheck warnings
+ update configure macros, for quoting/escaping fixes per shellcheck
+ add option "--cursor-off-label"
+ add option "--erase-on-exit"
+ add dlg_getenv_num() and dlg_getenv_str().

For detailed list of all changes, bugfixes and improvements, see CHANGES.

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vendor/dialog: upgrade from 1.2-20150920 to 1.3-20200327

Summary of notable changes:

- add "--week-start" option for calendar widget
- modify editbox widget to add a trailing newline if the text ha

vendor/dialog: upgrade from 1.2-20150920 to 1.3-20200327

Summary of notable changes:

- add "--week-start" option for calendar widget
- modify editbox widget to add a trailing newline if the text has none
to ensure the last line is not ignored
- use Gregorian algorithm for leap year
- fix a regression from 2015/05/13 changes for escaping; it is necessary
to retain backslashes within quotes to make "\Z" escapes work
- change explicit checks for space character used for select or toggle
to make this rebindable to "TOGGLE"
- improve performance with very long command-lines
- interpret $DIALOGOPTS before expanding "--file", etc., to allow
the environment variable to turn on tracing in that process
- improve handling of SIGWINCH for several widgets
- add options --print-text-only, and --print-text-size for scripts that
adjust the widget size according to how the captions are formatted
- when trimming blanks, treat unconverted tabs the same as spaces
- allow for underline- and reverse-video flags in the ".rc" file

For detailed list of all changes, bugfixes and improvements, see CHANGES.

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Vendor branch: Update dialog 1.2-20121230 => 1.2-20150920

The README.DELETED file is getting moved to trunk.

Import dialog-1.2-20121230.

Import dialog-1.2-20121230.