ngx-datatable: Re-ordering rows does not cause view to update

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[x] bug report => search github for a similar issue or PR before submitting
[ ] feature request
[ ] support request => Please do not submit support request here

Current behavior If the input rows are re-ordered, the visualization of the table is not updated.

Expected behavior If the input rows are re-ordered, I would expect the view to reflect this change.

Reproduction of the problem In the following component, select the second row and click the “Up” button.

Expected behaviour: first row in table is “b”, second row in table is “a” Actual behaviour: Table does not change (first row “a”, second row “b”).

import { Component } from '@angular/core'

@Component({
  selector: 'table-test',
  template: `
  <swui-datatable 
      class="material"
      [rows]="rows" 
      [selected]="selected"
      [selectionType]="'single'">
        <swui-datatable-column name="Prop" prop="prop" [sortable]="false">
        </swui-datatable-column>
    </swui-datatable>
  <button (click)="clickUp()">Up</button>
  `
})

export class StartComponent {
  selected :any[] = []
  rows = [ { prop: 'a' }, { prop: 'b' } ]

  clickUp() {
    console.log(JSON.stringify(this.rows))
    let ix = this.getSelectedIx()
    let arr = [ ...this.rows ]
    arr[ix-1] = this.rows[ix]
    arr[ix] = this.rows[ix-1]
    this.rows.splice(0, this.rows.length, ...arr)
    console.log(JSON.stringify(this.rows))
  }

  getSelectedIx() {
    return this.selected[0]['$$index']
  }
}

What is the motivation / use case for changing the behavior? The user should be able to choose the order of a table arbitrarily.

• Table version: 2.2.3

• Angular version: 2.4.0