v2021.2.1

Improvements

• Complete overhaul of BrickLink cart and order importing.
• Sorting and filtering are undoable operations now just like in Excel. Also both are really
  one-time actions now: adding or removing items will not dynamically re-apply the sorting and
  filtering. There's reapply button to do it manually when you want to have the list resorted.

Added

• BrickLink Mass Update works on all supported fields now. The document you want to export has
  to be in Difference Mode, but this is activated automatically when importing your store
  inventory.
• Clicking the Error label (or pressing F6) will jump to the next field that has erroneous
  input.
• The filter in the add-item and import-set dialogs gained even more functionality: have a look at
  the tool-tip label to learn about it.
• Right-clicking on Minifigs gives you the option to quickly and easily filter for similar body
  parts, head gear, etc.
• Added support for finding parts using part-color-codes (element numbers) in the add-item dialog.

Fixed

A lot.

Please read the installation instructions.

I've also started a page with tutorials.