Shift+Click selection uses outdated anchor/cache after regular click

[phitschi]

Hello and thank you for this great component!
I'm currently using selection-grid-flow version 3.1.0 in a Vaadin 24.8.2 project and really like the way it extends the standard Grid functionality.

Unfortunately, I discovered a bug related to multi-selection with Shift+Click: the selection anchor does not reset after a regular click, leading to unexpected selection behavior.

Steps to Reproduce
Click on row 1 → [1] is selected
Click on row 5 (no modifier) → only [5] is selected
Shift + Click on row 7 → rows [1, 5, 6, 7] are selected ❌

Expected behavior
After clicking row 5, it should become the new selection anchor.
The Shift+Click on row 7 should then result in [5, 6, 7] only.

Minimal Reproducible Example

public class MySelectionGrid extends SelectionGrid<String> {

    public MySelectionGrid() {
        super();
        this.addColumn(String::toString).setHeader("Random String Column");
        this.setSelectionMode(SelectionMode.MULTI);
        this.setItems(createRandomString(100));

        // Uncomment the following block to fix the incorrect selection behavior:
//        this.addItemClickListener(event -> {
//            if (!event.isCtrlKey() && !event.isShiftKey() && !event.isMetaKey()) {
//                this.deselectAll();
//                this.select(event.getItem());
//            }
//        });
    }

    public static List<String> createRandomString(int count) {
        List<String> randomStrings = new ArrayList<>();
        for (int i = 0; i < count; i++) {
            randomStrings.add(UUID.randomUUID().toString());
        }
        return randomStrings;
    }
}

Workaround
If you uncomment the ItemClickListener block in the code above, the selection behavior becomes intuitive:
The selection is cleared on regular (non-modifier) clicks.
The clicked item becomes the new anchor for subsequent Shift+Click operations.

Thanks again for providing and maintaining this useful add-on!
Let me know if I can assist further in reproducing or testing the fix.

Best regards,
René