Type: upright glyphs on a vertical path keep vertical point type's cells, and the caret spans the column

On a vertical path, an upright glyph is now placed in its column as
vertical point type places it, then the column is centered on the path.

- Its cell starts at its place on the path; it started 0.12 em earlier
  with fonts whose cell top is less than a full cell above the baseline.
- A baseline shift moves it across the column instead of along the path.
- A horizontal scale widens it evenly about the column's center.
- A combining mark stays on its upright letter.
- The caret and the selection highlight span the column, half its em on
  each side of the path, instead of the font's ascent and descent.

With Skew, 3D Ribbon and Stair Step on a path that runs to the left,
letters are a quarter turn counterclockwise from upright glyphs: Skew and
3D Ribbon mirror both kinds there, and Stair Step keeps letters level. The
test, the progress doc and the params text of Tate-chu-yoko Settings now
state these conditions and the block's directions on a path.

crates/engine/src/cmd/textedit.rs

@@ -40,7 +40,7 @@ pub fn specs() -> Vec<CommandSpec> {
             "Character",
             [],
             None,
-            "{id? (default: the one selected type object), start?: byte, end?: byte (default: all text), story?: bool = false (all the text of every frame of the threaded story `id` is a frame of, in one undo step; no `start` or `end`), font?, style?, size?: pt, leading?: pt|\"auto\", tracking?, kerning?: 1/1000 em|\"auto\"|\"optical\", baselineShift?: pt, hScale?: %, vScale?: %, rotation?: deg, fill?: colour|\"none\", stroke?: colour|\"none\" (#rrggbbaa and #rgba are refused in both), keepModel?: bool (fill and stroke, as paint.setFill), strokeWidth?: pt, strokeOptions?: {weight?, cap?, join?, miterLimit?, align?, dash?, dashOffset?, alignDashes?} (as stroke.set: the character stroke), underline?, strikethrough?, allCaps?: bool, smallCaps?: bool, position?: \"normal\"|\"superscript\"|\"subscript\" (sizes from Document Setup), features?: [\"dlig\", \"-liga\", …], featureChanges?: [\"tnum\", \"-onum\", …] (OpenType features turned on, or with - off, on top of each character's own; its other features are kept), charAlign?: \"romanBaseline\"|\"emBoxTop\"|\"emBoxCenter\"|\"emBoxBottom\"|\"icfTop\"|\"icfBottom\", proportionalMetrics?: bool (full-width glyphs on the font's proportional widths: `palt` in horizontal type, `vpal` in vertical type), tateChuYoko?: bool (Character panel menu › Tate-chu-yoko, with Show East Asian Options: in vertical type those characters stand side by side across one em of the column; kept on the characters and ignored in horizontal type), tcyUpDown?, tcyLeftRight?: pt -1296..1296 (Character panel menu › Tate-chu-yoko Settings: in vertical type a block of tate-chu-yoko characters moves up by a positive Up/Down and down by a negative one, right by a positive Left/Right and left by a negative one, as one piece with the values of its first character; 0 by default; automatic digit blocks and horizontal type do not move; neither turns tateChuYoko on), standardVerticalRoman?: bool (Character panel menu › Standard Vertical Roman Alignment, with Show East Asian Options: in vertical type those half-width characters, such as Latin letters and digits, stand upright one below the other instead of being rotated; spaces and tate-chu-yoko blocks are not changed; kept on the characters and ignored in horizontal type; off by default), noBreak?: bool (Character panel menu › No Break: these characters stay on one line, including across a space inside the run), kashidas?: bool (Character panel menu › Kashidas: selected characters allow insertion only when both joined neighbors have it on; on by default), charDirection?: \"default\"|\"leftToRight\"|\"rightToLeft\" (Character panel menu › Character Direction: the characters are set left to right or right to left inside their paragraph, as a Unicode bidi embedding; default: as the bidi algorithm sets them), digits?: \"default\"|\"arabic\"|\"hindi\"|\"farsi\"|\"devanagari\"|\"bengali\"|\"gurmukhi\"|\"gujarati\"|\"odia\"|\"tamil\"|\"telugu\"|\"kannada\"|\"malayalam\" (Character panel menu › Digits: the numeral system every digit is drawn in, whatever was typed: Western, Arabic-Indic (hindi), Eastern Arabic-Indic (farsi) or an Indic script's own digits), fontHeightReference?: \"emBox\"|\"capHeight\"|\"xHeight\"|\"icfBox\" (Character panel › Set Font Height Reference: the height of the font that size measures, the em box by default; with a font that has no such height, or one outside 0.1 to 2 em, the em box), language?: name|tag (Character panel › Language: one of Document Setup's languages by name or BCP 47 tag, case-insensitive, such as \"Turkish\" or \"tr\"; the characters are shaped in it, so the font uses that language's forms (OpenType `locl`); saved as the tag, English: USA, the default, as none; new type takes the document's language), fontAxes?: {\"wght\": 650, …} (Character panel › Variable Font: the setting of each variation axis named, in the axis's units and clamped to its range; null: back to the style's own setting; other axes keep theirs; tags the font has no axis for are left out; a font or style change clears them; text.fontList {family, style} lists the axes)} style a character range (size/leading/baselineShift are document points and hScale includes the object transform; runs are split at the range ends) → {id, runs, warning?: text (the font or style set isn't available: its type is drawn in the fallback font or the family's closest style)}",
+            "{id? (default: the one selected type object), start?: byte, end?: byte (default: all text), story?: bool = false (all the text of every frame of the threaded story `id` is a frame of, in one undo step; no `start` or `end`), font?, style?, size?: pt, leading?: pt|\"auto\", tracking?, kerning?: 1/1000 em|\"auto\"|\"optical\", baselineShift?: pt, hScale?: %, vScale?: %, rotation?: deg, fill?: colour|\"none\", stroke?: colour|\"none\" (#rrggbbaa and #rgba are refused in both), keepModel?: bool (fill and stroke, as paint.setFill), strokeWidth?: pt, strokeOptions?: {weight?, cap?, join?, miterLimit?, align?, dash?, dashOffset?, alignDashes?} (as stroke.set: the character stroke), underline?, strikethrough?, allCaps?: bool, smallCaps?: bool, position?: \"normal\"|\"superscript\"|\"subscript\" (sizes from Document Setup), features?: [\"dlig\", \"-liga\", …], featureChanges?: [\"tnum\", \"-onum\", …] (OpenType features turned on, or with - off, on top of each character's own; its other features are kept), charAlign?: \"romanBaseline\"|\"emBoxTop\"|\"emBoxCenter\"|\"emBoxBottom\"|\"icfTop\"|\"icfBottom\", proportionalMetrics?: bool (full-width glyphs on the font's proportional widths: `palt` in horizontal type, `vpal` in vertical type), tateChuYoko?: bool (Character panel menu › Tate-chu-yoko, with Show East Asian Options: in vertical type those characters stand side by side across one em of the column; kept on the characters and ignored in horizontal type), tcyUpDown?, tcyLeftRight?: pt -1296..1296 (Character panel menu › Tate-chu-yoko Settings: in vertical type a block of tate-chu-yoko characters moves up by a positive Up/Down and down by a negative one, right by a positive Left/Right and left by a negative one, as one piece with the values of its first character; on a vertical path a positive Up/Down moves it toward the path's start and a positive Left/Right to the path's left; 0 by default; automatic digit blocks and horizontal type do not move; neither turns tateChuYoko on), standardVerticalRoman?: bool (Character panel menu › Standard Vertical Roman Alignment, with Show East Asian Options: in vertical type those half-width characters, such as Latin letters and digits, stand upright one below the other instead of being rotated; spaces and tate-chu-yoko blocks are not changed; kept on the characters and ignored in horizontal type; off by default), noBreak?: bool (Character panel menu › No Break: these characters stay on one line, including across a space inside the run), kashidas?: bool (Character panel menu › Kashidas: selected characters allow insertion only when both joined neighbors have it on; on by default), charDirection?: \"default\"|\"leftToRight\"|\"rightToLeft\" (Character panel menu › Character Direction: the characters are set left to right or right to left inside their paragraph, as a Unicode bidi embedding; default: as the bidi algorithm sets them), digits?: \"default\"|\"arabic\"|\"hindi\"|\"farsi\"|\"devanagari\"|\"bengali\"|\"gurmukhi\"|\"gujarati\"|\"odia\"|\"tamil\"|\"telugu\"|\"kannada\"|\"malayalam\" (Character panel menu › Digits: the numeral system every digit is drawn in, whatever was typed: Western, Arabic-Indic (hindi), Eastern Arabic-Indic (farsi) or an Indic script's own digits), fontHeightReference?: \"emBox\"|\"capHeight\"|\"xHeight\"|\"icfBox\" (Character panel › Set Font Height Reference: the height of the font that size measures, the em box by default; with a font that has no such height, or one outside 0.1 to 2 em, the em box), language?: name|tag (Character panel › Language: one of Document Setup's languages by name or BCP 47 tag, case-insensitive, such as \"Turkish\" or \"tr\"; the characters are shaped in it, so the font uses that language's forms (OpenType `locl`); saved as the tag, English: USA, the default, as none; new type takes the document's language), fontAxes?: {\"wght\": 650, …} (Character panel › Variable Font: the setting of each variation axis named, in the axis's units and clamped to its range; null: back to the style's own setting; other axes keep theirs; tags the font has no axis for are left out; a font or style change clears them; text.fontList {family, style} lists the axes)} style a character range (size/leading/baselineShift are document points and hScale includes the object transform; runs are split at the range ends) → {id, runs, warning?: text (the font or style set isn't available: its type is drawn in the fallback font or the family's closest style)}",
             has_doc,
             set_range_style
         ),