RT#7864: Bug: Touch issues with opening annotations

[rakunavi]

Hello all,

I would like to report a behavior I observed when interacting with annotations that have popup notes in PDF‑XChange Editor.

For example, consider any annotation (a highlight annotation is just one representative case) that has a popup note containing text. In such situations, hovering the mouse over the annotation displays the text as a tooltip, and double‑clicking the annotation opens the popup note.

When operating with a mouse, a single click on the annotation merely selects it and nothing further happens. However, when performing the same action on a touch screen, the result differs depending on how quickly the user moves from one annotation to the next. I found that when operating at a faster pace, the popup note may open unintentionally.

To clarify, “slow” and “fast” here do not refer to the speed of the tap itself (touch down / touch up), but rather to the interval between interacting with one annotation and the next when moving sequentially through multiple annotations.

In the video, I sequentially interact with seven annotations from top to bottom. The video consists of two main parts: the first half demonstrates mouse interaction, and the second half demonstrates touch interaction. Each half is further divided into two segments: first operating at a slow pace, then at a faster pace. For the mouse high‑speed demonstration, I used an AutoHotkey script, but the same result can be reproduced manually.

In short, the video simply performs the following four sequences:

1. Mouse interaction (Normal Speed)
2. Mouse interaction (High Speed)
3. Touch interaction (Normal Speed)
4. Touch interaction (High Speed)

As shown in the video, only in case 4 — fast touch interaction — some popup notes open unintentionally.

• Animation.gif

• sample.pdf

I found it curious that only rapid touch interaction produces a different result, so I am reporting this for reference.

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

[EDIT] Since a ticket has been officially issued for this request, I have changed the topic title as follows. 2026-7-14 6:11 JST (UTC+9)

• Previous Title: Different behavior between mouse and touch: fast touch interaction opens annotation popup notes unintentionally
• New Title: RT#7864: Bug: Touch issues with opening annotations

[Daniel - PDF-XChange]

Hello, rakunavi

Thank you for the report. I have escalated this to the dev team for review.
RT#7864: Bug: Touch issues with opening annotations

Kind regards,

[rakunavi]

Thank you, Daniel, for creating the ticket!

Thank you for taking time out of your busy schedule.
Please give my best regards to developers.

Best regards,
rakunavi