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8 changes: 4 additions & 4 deletions src/plugins/core/borders.ts
Original file line number Diff line number Diff line change
Expand Up @@ -355,10 +355,10 @@ export class BordersPlugin extends CorePlugin<BordersPluginState> implements Bor
// existingBorderSideToClear[side] = true means we should clear the border on that
// side of the existing adjacent zone before adding the new border.
const existingBorderSideToClear = {
left: force || !!newBorder?.right,
right: force || !!newBorder?.left,
top: force || !!newBorder?.bottom,
bottom: force || !!newBorder?.top,
left: !!newBorder?.right,
right: !!newBorder?.left,
top: !!newBorder?.bottom,
bottom: !!newBorder?.top,
};
let editingZone: Zone[] = [zone];
for (const existingBorder of this.borders[sheetId] ?? []) {
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17 changes: 17 additions & 0 deletions tests/borders/border_plugin.test.ts
Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@ import {
deleteCells,
deleteColumns,
deleteRows,
merge,
moveColumns,
moveRows,
paste,
Expand Down Expand Up @@ -201,6 +202,22 @@ describe("borders", () => {
});
});

test("import preserves merged cell borders", () => {
const b = DEFAULT_BORDER_DESC;
const allSides = { top: b, bottom: b, left: b, right: b };
const model = new Model();

setZoneBorders(model, { position: "all" }, ["B2:C3"]);
merge(model, "C2:C3");

const importedModel = new Model(model.exportData());

expect(getBorder(importedModel, "B2")).toEqual(allSides);
expect(getBorder(importedModel, "B3")).toEqual(allSides);
expect(getBorder(importedModel, "C2")).toEqual({ top: b, right: b });
expect(getBorder(importedModel, "C3")).toEqual({ bottom: b, right: b });
});

test("can set all borders in a zone", () => {
const model = new Model();

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