Incorrect Page Size Calculation in Table Pagination

[lemkeprzemyslaw]

Description
There is an issue with calculating the page size when both scrollbarV and virtualization are enabled. The page size is determined using Math.ceil, as seen in the following code snippet:

/**
 * Recalculates the sizes of the page
 */
calcPageSize(val = this.rows) {
    // Keep the page size constant even if a row has been expanded.
    // This is because an expanded row is still considered a child of
    // the original row, so the calculation uses rowHeight only.
    if (this.scrollbarV && this.virtualization) {
        const size = Math.ceil(this.bodyHeight / this.rowHeight);
        return Math.max(size, 0);
    }
    // If limit is passed, we are paging
    if (this.limit !== undefined) {
        return this.limit;
    }
    // Otherwise, use row length
    if (val) {
        return val.length;
    }
    // Default case
    return 0;
}

Problem
The current calculation treats the last row as fully visible even if just 1 pixel of it is displayed in the table. It does not account for the height of the bottom scrollbar. As a result, if the last row is partially visible but covered by the scrollbar, it is not included on the second page of the table. This leads to missing rows during pagination.

Expected Behavior
The table should fully display each row on every page. A row that is partially visible or obscured by the scrollbar should be treated as not visible and displayed on the next page. The pagination logic should ensure that only fully visible rows are counted on each page, preventing any rows from being cut off or excluded.

Steps to Reproduce

1. Enable scrollbarV and virtualization.
2. Ensure that the last row of the current page is partially visible but covered by the bottom scrollbar.
3. Observe that this row is not included in the second page of the table.

Suggested Fix
Use Math.floor instead of Math.ceil to ensure that each table row is fully visible on every page. Additionally, modify the calculation to take the scrollbar height into account when determining the page size.