Survex 1.4.20 released

[Olly Betts]

Survex 1.4.20 is now available:

https://survex.com/download.html

Here's the full NEWS file entry for this release:

Changes in 1.4.20 (2026-03-04):

* aven: The viewing volume now includes the vertical extent of terrain which
  fixes problems with the terrain being clipped when there's an extreme
  vertical difference between the terrain and the cave is extreme.
  Hopefully fixes #148, reported by Chris Curry.

* aven: Improve handling of the scale when reloading an updated version of the
  .3d file already being viewed.

* aven: Add missing shortcuts to Orientation menu and "Reverse Direction" menu
  item.  Reported by echarlie's friend.

* aven: Where possible use L for "Elevation" menu accelerator, which matches
  the shortcut key.

* cavern: Improve handling of Walls percentage gradient.  Support explicit
  percentage override ('p' suffix) and fix handling of overriding percentage
  gradient to specify a plumb.  Reported by echarlie on #survex.

* cavern: Support d:m:s for Walls bearings and gradients.  Reported by echarlie
  on #survex.

* cavern: Add `gps` as alias for `position` team role.  See:
  https://github.com/therion/therion/issues/709

* cavern: Warn for no blank after token in *cartesian (another case related to
  #135).

* manual: Document N, S, E and W shortcut keys for aven.

* manual: Mark up codes and tokens in tables which avoids them getting
  word-wrapped and hyphenated.  It also means they now get rendered in the
  tables the same way they are referred to in the text.

* manual: Separate each block of *instrument examples.

* manual: Consistently document versions where features were deprecated.

* Eliminate out-of-date postal address from licensing information.  Direct
  people who somehow didn't receive the licence text to a copy on the FSF
  website instead.

Here are SHA256 checksums should you want to verify the integrity of the
files:

992abf3b99ec8c7ab2a53520fcffdd01e20c64aca2e50702b62c9d90e861e0dd  survex-1.4.20.tar.gz
ce5ccbadb1da86ca59d78874ed008508252c3b8f1a4cc46f4d9d16e122cde62b  survex-microsoft-windows-1.4.20.exe

There are also detached GPG signatures in the download directory:
https://survex.com/software/1.4.20/

There are "release notes" on the wiki, which I'll try to keep updated
with any issues found, so take a look there for the latest information:

https://trac.survex.com/wiki/ReleaseNotes/1.4.20

Please report any issues you find which are not covered in the release
notes to the bug tracker: https://trac.survex.com/

Cheers,
    Olly
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