This closes #1749, fix incorrect adjust merged cells on remove rows (#1753)

Author: CooolNv

adjust.go

@@ -618,13 +618,15 @@ func (f *File) adjustMergeCells(ws *xlsxWorksheet, sheet string, dir adjustDirec
 		if dir == rows {
 			if y1 == num && y2 == num && offset < 0 {
 				f.deleteMergeCell(ws, i)
+				i--
 				continue
 			}
 
 			y1, y2 = f.adjustMergeCellsHelper(y1, y2, num, offset)
 		} else {
 			if x1 == num && x2 == num && offset < 0 {
 				f.deleteMergeCell(ws, i)
+				i--
 				continue
 			}
 
@@ -644,8 +646,8 @@ func (f *File) adjustMergeCells(ws *xlsxWorksheet, sheet string, dir adjustDirec
 }
 
 // adjustMergeCellsHelper provides a function for adjusting merge cells to
-// compare and calculate cell reference by the given pivot, operation reference and
-// offset.
+// compare and calculate cell reference by the given pivot, operation reference
+// and offset.
 func (f *File) adjustMergeCellsHelper(p1, p2, num, offset int) (int, int) {
 	if p2 < p1 {
 		p1, p2 = p2, p1

rows_test.go

@@ -353,6 +353,15 @@ func TestRemoveRow(t *testing.T) {
 	assert.NoError(t, f.RemoveRow(sheet1, 10))
 	assert.NoError(t, f.SaveAs(filepath.Join("test", "TestRemoveRow.xlsx")))
 
+	f = NewFile()
+	assert.NoError(t, f.MergeCell("Sheet1", "A1", "C1"))
+	assert.NoError(t, f.MergeCell("Sheet1", "A2", "C2"))
+	assert.NoError(t, f.RemoveRow("Sheet1", 1))
+	mergedCells, err := f.GetMergeCells("Sheet1")
+	assert.NoError(t, err)
+	assert.Equal(t, "A1", mergedCells[0].GetStartAxis())
+	assert.Equal(t, "C1", mergedCells[0].GetEndAxis())
+
 	// Test remove row on not exist worksheet
 	assert.EqualError(t, f.RemoveRow("SheetN", 1), "sheet SheetN does not exist")
 	// Test remove row with invalid sheet name