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Old 02-03-2026, 01:18 AM   #1
NotSoMobile
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Question PgDown / PgUp require 2 keypresses to register
This affects only specific ePub files and I am trying to track down if this is an issue with Calibre or a particular ePub producer.

Steps to reproduce:
  1. Download "compatible ePub" from: https://standardebooks.org/ebooks/ye...-zilboorg.epub
  2. Open it in the Calibre viewer.
  3. Try to press PgDown multiple times counting the number of keypresses.
    Observe that occasionally it takes 2 separate interactions to advance the page.

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Old 02-03-2026, 02:04 AM   #2
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I paged through about half that book and didnt notice any two key presses required. Are you in paged mode or flow mode in the viewer? In flow mode it can happen in paged mode it should never happen. In flow mode it happens at the end of an internal html file, when there are a few pixels left to scroll to reach the end of the file.
Last edited by kovidgoyal; 02-03-2026 at 02:06 AM.
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Old 02-03-2026, 02:22 AM   #3
kovidgoyal
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And this should take care of the issue in flow mode:
https://github.com/kovidgoyal/calibr...5aa12ce81d5b1d
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Old 02-03-2026, 03:07 AM   #4
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Quote:
Originally Posted by kovidgoyal View Post
Are you in paged mode or flow mode in the viewer?
Paged, can be reproduced in either. Please refer to the attached screen recording, it shows the bug and keypresses via OSD.

This is standard "stable" Calibre straight from the Debian 13 main repository:
Code:
Package: calibre
Version: 8.5.0+ds-1+deb13u1
Attached Files
File Type: zip repro.mp4.zip (2.03 MB, 14 views)
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Old 02-03-2026, 03:17 AM   #5
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Does not repro for me with actual standard stable calibre, not whatever BS debian is packaging. https://calibre-ebook.com/download_linux
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Old 02-03-2026, 05:39 AM   #6
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Quote:
Originally Posted by NotSoMobile View Post
Paged, can be reproduced in either. Please refer to the attached screen recording, it shows the bug and keypresses via OSD.

This is standard "stable" Calibre straight from the Debian 13 main repository:
Code:
Package: calibre
Version: 8.5.0+ds-1+deb13u1
You need to stop using repo versions and use the actual calibre 9.x version. Most repo versions are broken.
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Old 02-03-2026, 06:21 PM   #7
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OK, after some further testing...
  • Stable: 8.5.0+ds-1+deb13u1 - bug is present in both modes.
  • Backports: 8.16.2+ds+~0.10.5-3~bpo13+1 - bug is present in the flowed mode only.
  • Upstream: 9.10 github - bug is present ONLY in the flowed mode. Paged mode works perfectly.

Hope this helps.
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Old 02-03-2026, 09:17 PM   #8
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Quote:
Originally Posted by NotSoMobile View Post
OK, after some further testing...
  • Upstream: 9.10 github - bug is present ONLY in the flowed mode. Paged mode works perfectly.

Hope this helps.
Quote:
Originally Posted by kovidgoyal View Post
And this should take care of the issue in flow mode:
https://github.com/kovidgoyal/calibr...5aa12ce81d5b1d
I've quoted message #3 in this thread which states that a fix for the issue in flow mode has already been created and committed. If you are running from source, you can update now otherwise you will have to wait for the next release of calibre (9.2).
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