Selecting items by dragging directly over item names fails when scrollbars are visible (Links / Named Destination panes)

[rakunavi]

Hello all,

I have discovered a specific and highly reproducible UI touch-input bug in both the Links pane and the Named Destination pane.

When using a touch screen device, users cannot select items by dragging their finger directly over the item names if either the vertical or horizontal scrollbar is active.

Here are the exact reproduction conditions confirmed across three different touch screen PCs:

Reproduction Steps & Conditions

1. Open either the Links pane or the Named Destination pane.
2. Ensure that at least one of the following conditions is met so that a scrollbar appears:
   1. The columns are widened (or the pane is narrowed) so that the horizontal scrollbar is displayed.
   2. There are many items listed so that the vertical scrollbar is displayed.
3. Try to select multiple items by initiating a drag gesture (touch down and move) directly on top of an item's name.

Observed Behavior

• The bug: The drag gesture fails entirely, and no items are selected. It appears that the touch event is being completely intercepted or hijacked by the pane's scrolling system, prioritizing page panning over item selection.
• The exception: If you initiate the exact same drag gesture from the empty background space of the pane (where no item names exist), the multi-selection works perfectly, even when scrollbars are visible.
• Comparison: If neither scrollbar is visible (a small number of items and plenty of window space), dragging directly over item names works normally as expected. (Of course, mouse drag operations always work perfectly under any condition).

Expected Behavior
Touch drag-selection should work consistently from anywhere within the pane, including directly over item names, regardless of whether scrollbars are visible or not. The touch gesture for "item selection/dragging" should not be overridden by the container's swipe-to-scroll logic. It seems like a classic event conflict between touch-scrolling and item-dragging handlers in these specific list components.

Hoping that the above information will be of some help to you.
Thank you for your hard work on this great software.

Best regards,
rakunavi

- PDF-XChange Editor PRO Version: 11.0.1
- OS Version: Windows 11 Pro / Home 25H2 Build 26200.8655
- PC Model: GMKtec Nucbox M7 Pro with HUION Kamvas Pro 19 / Lenovo IdeaPad C340-15IWL / HP All-in-One 22-c0xx

[Daniel - PDF-XChange]

Hello, rakunavi

Thank you for the report, I have informed the Dev team of this, so it can be investigated when there is time.

Kind regards,