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* Multiline attributes: read, draw and save their text A multiline attribute (DXF attribute type 2, or 4 for a definition) has its text as embedded MTEXT after its own groups (`101 Embedded Object`); its own group 1 is empty. CADCraft read only the own groups, so the attribute drew nothing, and a save wrote it back empty: its text was lost. - `Attrib::multiline` keeps the multiline text; `text.value` holds its plain text, which ATTEDIT and the other value editors change; an edited value replaces the contents (`Attrib::multiline_text`). - DXF read: ATTRIB and ATTDEF split at the marker; the MTEXT parsing is shared with MTEXT entities (`mtext_from`). - Drawn as multiline text; ZOOM Extents counts it. - DXF write (2007 and later; earlier versions get one line): attribute type, alignment point and the embedded MTEXT, only what differs from unrotated text, as AutoCAD writes it. - INSERT and ATTSYNC give references the definition's multiline text placed with them; MOVE/ROTATE/SCALE, Properties rotation and scale, annotative scaling and FLATTEN carry it. - Tests: synthetic multiline ATTDEF and ATTRIB (read, drawn, saved, edited, pre-2007 save, damaged embedded groups); engine INSERT, MOVE, ATTEDIT and ATTSYNC. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * Multiline attributes: read MTEXT direction from its own groups (#667, as #834 does) #834 moves these lines' fix into the MTEXT reader; the same fix in the shared mtext_from keeps the two compatible. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> --------- Co-authored-by: Cody Vogt <18035288+codyvogt@users.noreply.github.com> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com> Co-authored-by: Brandon Thomas <echelon@gmail.com>