I have noticed what seems to be a bug involving the comment tools. The behavior causes strikethrough text to be automatically generated and interferes with single-key accelerators.
How to Reproduce the Behavior:
If the markup were underline or highlight, I could almost believe that this was an intentional feature, but automaticly plastering documents with strikethroughs seems bizzaire. I have not located a Preferences option that disables it. Regardless, the behavior conflicts with single-key accelerators because this strikethrough object generation overrides the keyboard shortcuts. For instance, typing "u" to switch to Highlight text fails to switch to the highlight tool, and instead redirects the letter "u" into the comment bubble.
We're sorry for the trouble you had while using the comment tool and thank you for sharing the detailed information.
Would it be possible to share a screenshot or a video recording of the current workflow and the issue as I tried reproducing the issue inhouse with the steps shared above, but the issue is not reproducible.
Also, would it be possible to share a sample PDF file with us through which you are able to reproduce the issue? If yes, please upload the file to the Document Cloud storage https://documentcloud.adobe.com/
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Also, please collect the process monitor logs of the machine on which you are experiencing this issue. Download the process monitor tool, run the tool, reproduce the issue, generate the logs and save it locally. Then upload it to the Document Cloud storage and share the logs with us for further investigation. https://labs.adobe.com/downloads/acrobatmonitor.html
Thanks for reaching out to us. We have analysed the problem mentioned by you and this is an existing feature .
First let us understand what the feature is:
1. Selecting a text and typing something is a keyboard shortcut to select the commenting tool "Add note to replace text". This behavior does not happen with the comment tools closed.
2. Simply placing the cursor somewhere and typing the something is a keyboard shortcut to enable the commenting tool "Insert text at cursor".
Now lets understand how the single key accelerator to select the highlight is supposed to work.
3. Pressing "U" will select the highlight tool and it will be visually seen in the comments toolbar(when comment pane is open) or the Quick toolbar(when comment pane is not open ). After this, when you select any text , it will be highlighted. This takes into account the preference "Enable text selection for Highlight, Strikethrough, and Underline".
So selecting a text and then typing 'U' is a keyboard shortcut for "Add Note to replace text" (Point no.1 above) and first selecting "U" then selecting text will lead to a highlight over the selected text(Point no. 3 above).
Hope this clarifies your doubt. Please feel free to reach out in case you have any concerns.
Thanks & regards