Ctrl + PageUp or PageDown doesn't work as expected as soon as document width on screen exceed the width of the window

Distribution

Mint LMDE 6 (Debian Edition, Bookworm based)

Package version

4.2.6

Frequency

Always

Bug description

Ctrl + PageUp or PageDown doesn't work as expected as soon as document width on screen exceed the width of the window.

Steps to reproduce

Ctrl + PageDown or Ctrl + PageUp is supposed to go forward or backward, page by page. And it works, but ONLY if document width on screen is lesser or equal to window width.

1. Open a document with multiple pages.
2. Go to page 2.
3. Use Ctrl + PageDown to go to page 3.
4. Zoom in in order to get the displayed page to exceed the width of the Xreader window.
5. Press Ctrl + PageUp or PageDown : there is no more change in page number, just change in lateral position in the current page.

As soon as you use zoom to get a larger width of the document you're reading, and exceed the width of the Xreader window, Ctrl + PageDown change its behavior to "scroll right", while Ctrl + PageUp becomes "scroll left". This is not expected, as mentioned in Xreader's menu.

Expected behavior

When Ctrl + PageDown is pressed, the supposed action is to go to the next page. Meanwhile, pressing Ctrl + PageUp is supposed to take you back to the previous page.

Additional information

No response

Reproduce the issue in Xreader using a multi-page document, then zoom until the page exceeds the window width and test Ctrl + PageUp/PageDown. Start by tracing the keyboard handling for these shortcuts alongside horizontal scrolling. Done means the shortcuts consistently move to the previous or next page without changing lateral position.