M7: Ungroup draws Form artwork in place, so its text can be edited (#2964, #3005)

Text drawn inside a Form XObject was one piece of artwork in Edit text &
images: HTML-to-PDF output that wraps a block with a translucent picture
in a transparency group showed a whole table as a single box with no
editable text (#3005).

Ungroup (artwork right-click menu; image_edit action ungroup) replaces
that placement's Do with the form's content, wrapped as
q <Matrix> cm <BBox> re W n ... Q, its resources merged into a copy of the
page's under fresh names where they clash (fonts, XObjects, graphics
states, colour spaces incl. inline images', patterns, shadings,
properties). The form object and its other placements are untouched; a
form in a layer keeps it as /OC ... BDC ... EMC.

Refused rather than changed: knockout groups, transparency groups that
blend inside (used gs, nested forms) or are drawn translucent, blended or
soft-masked at the Do (followed per parameter across q/Q and streams),
tagged form content, content that can't be decoded strictly or parsed,
and unbalanced Q. cos gains Stream::decoded_strict_within for that.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RUNQSPVXx3dDBabRZHAnjz

parity/acrobat-features.toml

@@ -1878,8 +1878,8 @@ milestone = "M7"
 status = "partial"
 commands = ["edit.edit_text"]
 tools = ["text_lines", "text_paragraphs", "text_edit", "text_edit_layout", "text_font_files", "text_font_import", "text_fonts"]
-evidence = ["crates/edit/src/tests.rs::paragraphs_are_found_and_rewrapped", "crates/edit/src/tests.rs::text_lines_are_found_and_replaced_in_place", "crates/ui-egui/tests/it/editing.rs::editing_existing_text_in_place", "crates/automation/tests/it/automation.rs::editing_existing_text_through_tools", "crates/edit/src/tests.rs::a_line_whose_operator_starts_the_next_stream_can_be_edited", "crates/automation/tests/it/automation.rs::a_line_split_across_content_streams_is_listed_and_edited", "crates/ui-egui/tests/it/editing.rs::selected_text_formatting_keeps_the_rest_of_the_paragraph_and_reopens", "crates/edit/src/tests.rs::marked_paragraph_boundaries_and_cross_stream_transforms_survive_rewrite", "crates/automation/tests/it/automation.rs::explicit_font_and_disjoint_ranges_save_reopen_through_tools", "crates/edit/src/tests.rs::disjoint_style_ranges_preserve_unselected_runs_and_validate_utf8_atomically", "crates/engine/tests/it/document_fonts.rs::opentype_cff_document_font_preserves_program_codes_and_rendering_after_reopen", "crates/ui-egui/tests/it/editing.rs::cropped_images_do_not_intercept_text_and_stay_inside_each_page", "crates/automation/tests/it/automation.rs::clipped_image_bounds_and_text_edit_save_reopen_through_tools", "crates/edit/src/tests.rs::mixed_styles_and_matrix_sizes_form_visual_regions_without_merging_columns", "crates/edit/src/tests.rs::rich_region_edits_preserve_styles_positions_and_delete_all_runs_after_reopen", "crates/ui-egui/tests/it/editing.rs::one_editor_contains_mixed_styles_and_visual_rows", "crates/ui-egui/tests/it/editing.rs::inline_editor_preserves_source_font_and_previews_live_bounds", "crates/fonts/src/pdf/tests.rs::mac_subset_cmap_uses_pdf_unicode_without_changing_source_program", "crates/automation/tests/it/automation.rs::mixed_visual_region_edit_preview_save_reopen_and_undo_through_tools", "crates/ui-egui/tests/it/ui.rs::the_edit_tab_turns_on_edit_text_and_images", "crates/ui-egui/tests/it/editing.rs::the_caret_on_a_small_row_is_as_tall_as_that_row", "crates/edit/src/tests.rs::uzbek_and_kazakh_cyrillic_use_the_bundled_latin_face", "crates/automation/tests/it/automation.rs::editing_uzbek_and_kazakh_cyrillic_through_tools", "crates/edit/src/tests.rs::styled_paragraph_batches_cyrillic_without_changing_source_fonts", "crates/edit/src/tests.rs::styled_paragraph_over_240_fallback_glyphs_splits_and_refuses_atomically", "crates/edit/src/tests.rs::styled_fallback_batches_keep_face_choices_and_range_styles", "crates/edit/src/tests.rs::styled_fallback_shards_keep_text_advances_and_alignment", "crates/edit/src/tests.rs::styled_fallback_budget_is_enforced_before_objects_are_written", "crates/edit/src/tests.rs::styled_fallback_same_base_font_and_character_keep_both_weights", "crates/automation/tests/it/automation.rs::styled_cyrillic_fallback_is_batched_through_tools_and_reopen", "crates/ui-egui/tests/it/editing.rs::escape_in_an_open_paragraph_selects_its_box_for_delete"]
-notes = "The Edit tab turns Edit text & images on at once, as in Acrobat (leaving the tab puts the tool down and applies an edit in progress); Esc in an open paragraph leaves its text and selects its box, so Delete removes it (the unapplied draft is discarded); click a paragraph box and retype it in place (font reused or Helvetica substituted, colour and spacing kept, rewrapped); a page's /Contents pieces are parsed joined, so a line whose operands and operator sit in different pieces is listed and edited (lines and paragraphs still don't join across pieces; Edit image still parses each piece alone); drag a box to move it or its right-edge handle to rewrap it (edit.text-move-resize); per-character formatting changes are next Since #1116: mixed-style visual regions retain source rows, subset encodings, colour and baseline anchors in one textless-background editor. Explicit paragraph/heading scopes constrain grouping; compatible graphics planes permit cross-stream regions. Full matching document fonts complete absent subset glyphs; installed/file selection, TrueType/OpenType-CFF embedding and disjoint UTF-8 range styles have save/reopen coverage. Single-face OpenType shaping/bidi retains logical text through ToUnicode/ActualText. Replacement text the paragraph's font can't show takes the craft-fonts Japanese faces when they draw all of it (Uzbek қ, Kazakh ә are in none of them), else the bundled Inter face, so those letters write in every build (#2593). Legacy non-SFNT preview, mixed-font/style contextual runs, full structure-tree preservation and author intent in untagged PDFs remain limited; Styled-path outline fallback batches by actual face with 240 glyphs per font and preserves source styles; adjacent equal-font/style characters form runs. At most 15360 distinct fallback glyphs per styled paragraph; missing glyphs are refused before fallback objects are written. Glyph coverage, mixed contextual shaping, single-style fallback and stale-font cleanup are unchanged; see docs/editing-existing-text.md"
+evidence = ["crates/edit/src/tests.rs::paragraphs_are_found_and_rewrapped", "crates/edit/src/tests.rs::text_lines_are_found_and_replaced_in_place", "crates/ui-egui/tests/it/editing.rs::editing_existing_text_in_place", "crates/automation/tests/it/automation.rs::editing_existing_text_through_tools", "crates/edit/src/tests.rs::a_line_whose_operator_starts_the_next_stream_can_be_edited", "crates/automation/tests/it/automation.rs::a_line_split_across_content_streams_is_listed_and_edited", "crates/ui-egui/tests/it/editing.rs::selected_text_formatting_keeps_the_rest_of_the_paragraph_and_reopens", "crates/edit/src/tests.rs::marked_paragraph_boundaries_and_cross_stream_transforms_survive_rewrite", "crates/automation/tests/it/automation.rs::explicit_font_and_disjoint_ranges_save_reopen_through_tools", "crates/edit/src/tests.rs::disjoint_style_ranges_preserve_unselected_runs_and_validate_utf8_atomically", "crates/engine/tests/it/document_fonts.rs::opentype_cff_document_font_preserves_program_codes_and_rendering_after_reopen", "crates/ui-egui/tests/it/editing.rs::cropped_images_do_not_intercept_text_and_stay_inside_each_page", "crates/automation/tests/it/automation.rs::clipped_image_bounds_and_text_edit_save_reopen_through_tools", "crates/edit/src/tests.rs::mixed_styles_and_matrix_sizes_form_visual_regions_without_merging_columns", "crates/edit/src/tests.rs::rich_region_edits_preserve_styles_positions_and_delete_all_runs_after_reopen", "crates/ui-egui/tests/it/editing.rs::one_editor_contains_mixed_styles_and_visual_rows", "crates/ui-egui/tests/it/editing.rs::inline_editor_preserves_source_font_and_previews_live_bounds", "crates/fonts/src/pdf/tests.rs::mac_subset_cmap_uses_pdf_unicode_without_changing_source_program", "crates/automation/tests/it/automation.rs::mixed_visual_region_edit_preview_save_reopen_and_undo_through_tools", "crates/ui-egui/tests/it/ui.rs::the_edit_tab_turns_on_edit_text_and_images", "crates/ui-egui/tests/it/editing.rs::the_caret_on_a_small_row_is_as_tall_as_that_row", "crates/edit/src/tests.rs::uzbek_and_kazakh_cyrillic_use_the_bundled_latin_face", "crates/automation/tests/it/automation.rs::editing_uzbek_and_kazakh_cyrillic_through_tools", "crates/edit/src/tests.rs::styled_paragraph_batches_cyrillic_without_changing_source_fonts", "crates/edit/src/tests.rs::styled_paragraph_over_240_fallback_glyphs_splits_and_refuses_atomically", "crates/edit/src/tests.rs::styled_fallback_batches_keep_face_choices_and_range_styles", "crates/edit/src/tests.rs::styled_fallback_shards_keep_text_advances_and_alignment", "crates/edit/src/tests.rs::styled_fallback_budget_is_enforced_before_objects_are_written", "crates/edit/src/tests.rs::styled_fallback_same_base_font_and_character_keep_both_weights", "crates/automation/tests/it/automation.rs::styled_cyrillic_fallback_is_batched_through_tools_and_reopen", "crates/ui-egui/tests/it/editing.rs::escape_in_an_open_paragraph_selects_its_box_for_delete", "crates/edit/src/tests.rs::ungrouping_form_artwork_makes_its_text_editable", "crates/automation/tests/it/automation.rs::ungrouping_a_table_drawn_in_a_form_makes_its_text_editable", "crates/ui-egui/tests/it/editing.rs::ungroup_in_the_artwork_menu_makes_a_forms_text_editable"]
+notes = "The Edit tab turns Edit text & images on at once, as in Acrobat (leaving the tab puts the tool down and applies an edit in progress); Esc in an open paragraph leaves its text and selects its box, so Delete removes it (the unapplied draft is discarded); click a paragraph box and retype it in place (font reused or Helvetica substituted, colour and spacing kept, rewrapped); a page's /Contents pieces are parsed joined, so a line whose operands and operator sit in different pieces is listed and edited (lines and paragraphs still don't join across pieces; Edit image still parses each piece alone); drag a box to move it or its right-edge handle to rewrap it (edit.text-move-resize); per-character formatting changes are next Since #1116: mixed-style visual regions retain source rows, subset encodings, colour and baseline anchors in one textless-background editor. Explicit paragraph/heading scopes constrain grouping; compatible graphics planes permit cross-stream regions. Full matching document fonts complete absent subset glyphs; installed/file selection, TrueType/OpenType-CFF embedding and disjoint UTF-8 range styles have save/reopen coverage. Single-face OpenType shaping/bidi retains logical text through ToUnicode/ActualText. Replacement text the paragraph's font can't show takes the craft-fonts Japanese faces when they draw all of it (Uzbek қ, Kazakh ә are in none of them), else the bundled Inter face, so those letters write in every build (#2593). Legacy non-SFNT preview, mixed-font/style contextual runs, full structure-tree preservation and author intent in untagged PDFs remain limited; Styled-path outline fallback batches by actual face with 240 glyphs per font and preserves source styles; adjacent equal-font/style characters form runs. At most 15360 distinct fallback glyphs per styled paragraph; missing glyphs are refused before fallback objects are written. Glyph coverage, mixed contextual shaping, single-style fallback and stale-font cleanup are unchanged; see docs/editing-existing-text.md. Text drawn inside a Form XObject (HTML-to-PDF output, stamped or imposed pages) is grouped artwork until Ungroup (artwork right-click menu; image_edit action ungroup) draws that placement in place with its resources merged; knockout groups and transparency groups that blend inside or are drawn translucent are refused, so ungrouping never changes the pixels."
 
 [[feature]]
 id = "edit.text-reflow"