Shift+Arrow keys to multi-select broken in opposite direction

[ellatrix]

Issue Overview

When using Shift+Arrow keys to multi-select blocks, and then going back in the opposite direction, the selection is reset at the start block + block at the other side.

Steps to Reproduce (for bugs)

1. Select a block.
2. Use Shift+Arrow Down to trigger multi-selection. Select a few blocks.
3. Use Shift+Arrow Up to to go in the opposite direction again, i.e. deselect the last select block and so on. Instead the selection is reset and the start block + the block above are multi-selected.

Expected Behavior

To de-select blocks one at a time.

Related Issues and/or PRs

#5513 (comment)

[jasmussen]

Not sure if this is the same issue or a different one. But there seems to be an additional issue with shift selecting. GIF:

Shift select across paragraphs works.

Setting the caret in the last text block and shift selecting downwards, selects until the end of the text in that block, as it should.

Setting the caret in the first block and shift selecting upwards, doesn't seem to select until the beginning of the text in that block, as would be expected.

It's a bit hard to explain — but is that related to this ticket? Or a separate issue?

[ellatrix]

I think I see what you mean. Probably better to open a separate issue as this would be a separate fix. I'll see if I can look into it soon!