### Loading

1. The data should be loaded with:
  * a complex table with:
    - one heading row,
    - two heading columns,
    - merged cells in heading columns section,
  * a table with 2 tbody sections in the DOM - should be rendered as a table with one tbody.
  * a table with no tbody sections in the DOM - should be rendered as a table with one tbody.
  * a table with a thead section between two tbody sections in dom - should be rendered as a table with one thead and on tbody section in proper order: 1, 2, 3.

2. Main toolbar should have insert table dropdown.

3. While the table cell is selected there should be a toolbar attached to the table with 3 dropdowns:
  * column dropdown with items:
    - header column,
    - insert column left,
    - insert column right,
    - delete column.
  * row dropdown with items:
    - header row,
    - insert row below,
    - insert row above,
    - delete row.
  * merge cell dropdown with items:
    - merge cell up,
    - merge cell right,
    - merge cell down,
    - merge cell left,
    - split cell vertically,
    - split cell horizontally,

4. While the table widget is selected there should be `bold` and `italic` buttons

### Testing

Inserting table:

1. Insert table of chosen size - the inserted table should have number columns & rows as selected in dropdown.
2. Re-opening dropdown should reset selected table size.
3. Table cannot be inserted into other table.

Column manipulation:

1. Insert column in table heading section.
2. Insert column in merged cell.
3. Insert column at the end/beginning of a table.
4. Remove column from table heading section.
5. Remove column of merged cell.
6. Change column heading status.

Column manipulation:

1. Insert row in table heading section.
2. Insert row in merged cell.
3. Insert row at the end/beginning of a table.
4. Remove row from table heading section.
5. Remove row of merged cell.
6. Change row heading status.

Merging cells:

1. Merge cell on the left/right/top/bottom of current cell.
2. Merge cell on the left/right/top/bottom touching another table section (mergin a table cell from header row with a cell from body should not be possible).
3. Merge cells that are already merged.

Splitting cells:
1. Split not merged cell vertically/horizontally.
2. Split already merged cell vertically/horizontally.

Nested tables:
1. Verify that nested tables are displayed correctly and do not throw an error.
2. Verify that it is possible to insert new table inside existing table cell.
3. Verify that it is possible to copy & paste nested table below the existing one (in the editor root).
4. Verify that it is possible to copy & paste nested table inside other table cell.
  * Copying & pasting a table only (in the clipboard there is only a table with no siblings) should merge content of this table with the nearest ancestor table. In other words: pasted table is not inserted as a table (as a widget) in table cell, but it is merged with the first found table ancestor.
  * Copying & pasting a table with any sibling (e.g. a paragraph) should paste exactly what has been copied.
5. Hover the outer table with the mouse cursor. Verify that the yellow border and selection handle on the inner table is not visible (they should be visible only for the hovered table).
6. Select the outer table. Verify that the blue selection handle on the inner table is not visible (it should be visible only for the selected table).