Recolor Artwork: a slider edit changes the color mode of its own row only

The color sliders now mark the row they edit with `model: "new"`
instead of a dialog-wide flag, and `recolor.apply` reads a row's own
`model` before the command's. Rows the sliders did not edit keep each
color's model, so with RGB art and a CMYK color group, a slider edit of
one row no longer turns the other rows' art CMYK. Another edit of the
row's new color, Reset and rows reduced again remove the mark, and
`recolor.randomize` moves it with its new color.

docs/control-protocol.md

@@ -253,12 +253,13 @@ and spot colours exist; the dialog then stays open.
 
 Recolor Artwork: `ui.recolorDialog {colors?, library?, group?}` opens the `recolor` dialog on the selected art
 (`colors`: a count for an n-colour job, or colours to assign as the new colours; `library`: Limit to Library, a library
-or `"document"`, `""` for the first library; `group`: a colour group, Edit or Apply Color Group). Fields: `rows` (`[{from: [keys], to: key, exclude?, tint?}]`
+or `"document"`, `""` for the first library; `group`: a colour group, Edit or Apply Color Group). Fields: `rows` (`[{from: [keys], to: key, exclude?, tint?, model?}]`
 as `recolor.reduce` returns them), `colors` (null for Auto), `method`, `preserveWhite`, `preserveBlack`,
 `preserveGrays`, `limitTo`, `groupName`, `tab` (`assign` or `edit`), `rule` (harmony id), `linked`, `preview`,
 `sliderMode` (the mode of the color sliders under the rows: `hsb`, `rgb`, `cmyk`, `lab`, or `tint` for a row whose new
 color is a spot color of the library; unset, they show the new color's own model). The sliders edit the first selected
-row's new color; once they have, the preview and confirm send `recolor.apply` with `model: "new"`. Setting
+row's new color and give that row `model: "new"`, so the preview and confirm give only that row's art the color in
+the sliders' mode; another edit of the row's new color, Reset and rows reduced again remove it. Setting
 `colors`, a preserve flag or `limitTo` reduces the rows again (also on `ui.dialog.confirm`). The dialog previews
 `recolor.apply` on the canvas; confirm keeps it as one undo step (with a group, the group is rewritten in the same
 step; with no art selected only the group changes). In the Swatches panel, double-clicking a colour group's folder,

docs/mcp.md

@@ -1919,9 +1919,10 @@ tints of a global swatch share its row; White and Black are preserved by default
 `[{from: [keys], to: key}]` to edit and pass to `recolor.apply {map, method?, model?, limitTo?, group?, groupColors?, rename?}`.
 For scripts and MCP, `model` selects the replacement color model: `keep` (default) retains each
 original color's model, `new` takes the replacement's model, and `document` converts replacements
-and edited color groups to the document's model. Invalid values fail before editing. The Recolor
-Artwork dialog sends `new` once its color sliders have edited a row's new color in a color mode. A
-returned `note` reports a model conversion in `keep` mode.
+and edited color groups to the document's model. A row's own `model` (the same values) takes the
+place of the command's for that row's colors. Invalid values fail before editing. The Recolor
+Artwork dialog gives a row `model: "new"` when its color sliders edit the row's new color in a color
+mode. A returned `note` reports a model conversion in `keep` mode.
 
 `method` says how a row's colours take its new colour: `exact`, `preserveTints` (tints of the row's darkest colour
 stay tints), `scaleTints` (every colour becomes a tint as light, relative to the darkest), `tintsShades` (lighter and
@@ -1930,7 +1931,7 @@ the others turn by the same hue). `limitTo` snaps new colours to a swatch librar
 `recolor.randomize {map, order?, saturationBrightness?, seed?}` shuffles or varies new colours; a row with
 `exclude: true` keeps its colours. With `limitTo`, a row's `tint` (a percentage, default 100) gives the art
 linked to the global or spot swatch its new color is that share of its tint; `tint` must be a number. `recolor.randomize`
-moves a row's `tint` with its new color and removes it from a color it changes. `swatch.editGroup {group, colors, rename?}` rewrites a colour group in one undo
+moves a row's `tint` with its new color and removes it from a color it changes, and moves a row's `model` with its new color. `swatch.editGroup {group, colors, rename?}` rewrites a colour group in one undo
 step (art linked to its global swatches follows), and `recolor.apply` with `group` recolours the art and rewrites the
 group together. Art linked to one of the group's global swatches stays linked when the swatch is rewritten with its
 row's new color (the default without `groupColors` when the rows follow the group's order), so a later `swatch.edit` still