The LAYER record only grew a plot flag in R2000: R13/R14 carry frozen,
off, frozen-in-new-viewport and locked as four separate bits and nothing
else, so the reader has no bit to read and leaves `is_plottable` at the
`false` it starts from. Every layer of such a drawing then read as "don't
plot", the plot pass dropped every wire, and PLOT, the preview and
QUICKPRINT all rendered a blank sheet while the drawing still looked right
on screen — display and plot visibility are separate flags, so nothing
about the drawing itself looked wrong.
Restore what the format means by default — a layer plots unless a file
says otherwise — for the two versions that carry the four-bit record, on
both load entry points (bytes and path). R2000 and later keep the flag the
file stores, so a genuinely unplottable layer (DEFPOINTS) stays unplottable.
Tests: an R14 DWG written and read back keeps every layer plottable, the
path-based entry point does the same for R13, a modern file keeps the flag
it stored, and an R14 drawing tessellating to wires that are all
plot_visible locks the whole chain that used to blank the page.
Entities that carry the standard PE_URL XDATA record (what HYPERLINK writes)
can now be followed from the canvas: Ctrl+click opens the link in the system
browser and consumes the click, so no box/lasso selection starts.
- scene::selection::pe_url_of() reads the record with the same rule as the
Properties panel hyperlink field; unit-tested.
- The ViewCube/compass hit region wins over a hyperlink drawn beneath it.
- Unchanged behaviour when Ctrl is not held or the entity has no link.
DIMTMOVE=1 ("moves the text and adds a leader") draws the leader from the midpoint
of the dimension line to the text, so a text dragged outside the dimension line gets
a diagonal that starts in the middle of the line and crosses the extension lines.
Mechanical-drawing practice (GB/T 4458.4, and what AutoCAD itself draws) extends the
dimension line along its own axis so that it runs underneath the text. Linear and
aligned dimensions now do that whenever the text is outside the dimension-line extent;
when the text is still inside it (only moved up/down) the previous connect-to-text
leader is kept. Every other dimension type is unchanged, and only dimensions with
DIMTMOVE=1 are affected at all (the shipped default is 0).
Adds four unit tests covering the placements (outside right, outside left, inside,
radius draws none) plus an integration render smoke test driven through the real
Scene::entity_wires() -> export_pdf() pipeline, gated by OCS_DIM_LEADER_PDF so CI
stays side-effect free.
ysdirector