Merge pull request #7181 from dotCooCoo/fix/area-type-inset-from-edge

Area type: Inset Spacing on a shaped frame is measured from the frame's edge

docs/target-app-parity.md

@@ -1260,6 +1260,7 @@ Moved from the ROADMAP's "Shipped so far" on 2026-10-10. Update it when a featur
 - **Paragraph alignment:** the shared Paragraph/Properties alignment row leaves every button unselected when the paragraphs it acts on differ. Auto resolves per paragraph; choosing an alignment uses the existing command. Headless paragraph_mixed_alignment_* regressions exercise mixed → Center → Undo, caret/uniform states, Unicode range boundaries, Auto/direction, split runs and grouped text. These regressions and full integration CI pass. Original captures confirm mixed → Center → Undo in the existing alignment-button layout. The [public Paragraph panel guide](https://helpx.adobe.com/illustrator/desktop/design-with-text/edit-format-text/paragraph-panel-overview.html) lists the seven controls, but does not specify mixed-state rendering. Other paragraph fields remain outside this change; scores and hours unchanged.
   For Auto Size area type in columns, the bisection for the frame's height runs on the lines of the one-column layout, and its result is checked with at most two layouts of the columns. When the text wraps around objects or does not fit the one-column layout, or when the check fails, the columns are laid out at every step of the bisection, as before. Typing at the start of a story of 50,000 characters in 2 columns took 1,670 ms a keystroke and now takes 292 ms (release build, `auto_height_in_columns_typing_timing`).
   Exports to PDF, EPS, SVG, EMF, WMF and the raster formats warn about the area type and type on a path that they draw without the text that doesn't fit, and give their ids, as Print and Print Preview do.
+  On a shaped area type frame, Inset Spacing keeps text that far from the frame's edge, holes included, measured from the edge itself rather than along the line; the archived help treats the inset as the space an area type object leaves between its text and the path that bounds it (<https://help.adobe.com/archive/en_US/illustrator/cs5/illustrator_cs5_help.pdf#page=317>, <https://web.archive.org/web/20220911143322/https://helpx.adobe.com/pdf/cs6/illustrator_reference.pdf#page=325>). A rectangular frame keeps its inset from each side as before, and a column's inner edges keep it once. Tests: `layout::region::inset_on_a_shaped_frame_is_measured_from_its_sloped_edge`, `inset_keeps_text_clear_of_a_hole_s_sloped_edges`, `inset_applies_once_at_a_column_s_edge_and_at_the_frame_s_edge`.
   An edit copies a thread's story only when it changes one of the thread's frames: with a story of 50,000 characters threaded through 8 frames with a style change at every word, moving another object took 7.8 ms and now takes 0.013 ms, and a frame of a drag took 7.2 ms and now takes 0.012 ms (release build, `threaded_story_edit_timing`).
   When a story flows through threaded area type, each frame is measured with the whole paragraphs of the story that it needs and a few more, not with the whole rest of the story, and it keeps the same text as before. A story of 1,500 one-line paragraphs (55,892 bytes) through 40 frames was laid out over 2,126,762 bytes of text while the frames were measured, and is now laid out over 21,035 (`thread::tests::many_frames_measure_about_the_text_they_take`). Type on a path, Shrink Text to Fit, lines aligned other than to the top, and a frame whose share ends in the story's last paragraph are still measured with the whole rest.
   A paragraph that continues from one threaded frame into the next has its first-line indent and bullet or number in the frame where it starts; in the next frame its first line starts where its wrapped lines start. In frames that are no longer threaded, copies of a frame and point type converted from one, the first paragraph has its indent and bullet or number again.