Ctrl/Shift & Double Click fails while Search filter applied

When transferring items from another inventory/storage into the character inventory, holding ALT while dragging and dropping a stack normally opens the quantity-selection window, allowing the player to choose how many items to transfer.

However, this behavior stops working when the Search field on the right hand inventory panel is being used to filter the inventory.

With a search/filter active, holding ALT and dragging the filtered item into the character inventory transfers the entire stack immediately, instead of opening the quantity-selection dialog. When this is done immediately again afterwards, it works as expected.

I can reproduce this with almost 100% consistency.

Steps to reproduce

1. Open the inventory interface with access to another storage inventory containing a stack of multiple items.
2. Make sure the Search field on the right-hand inventory panel is empty.
3. Hold ALT and drag the item stack from the storage inventory into the character inventory.
4. Confirm that the quantity/split dialog appears as expected.
5. Move the item back if necessary.
6. Enter the item's name into the Search field on the right-hand inventory panel, so that the inventory is filtered.
7. Hold ALT and drag the same item stack into the character inventory.
   Actual resultThe quantity-selection window does not appear.
   Instead, the entire item stack is immediately transferred into the character inventory.