* dxf: proxy objects and entities keep their class through a save (#1812)
A proxy (ACAD_PROXY_OBJECT, ACAD_PROXY_ENTITY) names its class by number
in group 91: 500 plus the class's place in the CLASSES section (DXF
Reference). Saving rewrites CLASSES (CADCraft's own classes, then the kept
ones), but kept proxies were written with their read number, which then
named another class: an R14 file's visual styles came back as SCALE,
TABLESTYLE or MLEADERSTYLE, and numbers past the last class stayed.
The reader now keeps the file's class order (Foreign::class_order) when
the file has proxies, and the CLASS records its proxies name. The writer
renumbers each kept proxy to its class's place in the written CLASSES and
drops a proxy whose number names no class (with what it owns and its
dictionary entry). The DWG bridge writes through the same path.
Test proxies_keep_their_class_when_classes_are_rewritten (a file with
VISUALSTYLE and WIDGETX first in CLASSES, proxies of both and of a number
past the last class, and a proxy entity; also through a second save).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019Nnsfu3QGqjD1aFZbBgUWP
* docs: the proxy class fix is for DXF save (#1812)
From the local CodeRabbit review: DWG save drops proxy entities (acadrust)
and proxy objects through DWG weren't checked, so the progress log says DXF.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019Nnsfu3QGqjD1aFZbBgUWP
* dxf: a proxy's class number is found outside 102 groups (#1812)
From the PR review: an application's 102 {NAME ... 102 } group before a
proxy's own groups can hold a group 91, which was read as the class number
and overwritten on save. class_group finds the first 91 outside 102 groups
(before xdata), for reading and renumbering alike (test
proxies_keep_their_class_when_classes_are_rewritten, now with a {MYAPP
group holding a 91 that stays as it was).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019Nnsfu3QGqjD1aFZbBgUWP
---------
Co-authored-by: Tyrel Haveman <1434399+tyrel@users.noreply.github.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: Brandon Thomas <echelon@gmail.com>
