[okular] [Bug 407449] New: Horizontal scrollbar appears even when page is narrower than the viewport

[David Hurka]

https://bugs.kde.org/show_bug.cgi?id=407449

            Bug ID: 407449
           Summary: Horizontal scrollbar appears even when page is
                    narrower than the viewport
           Product: okular
           Version: 1.7.0
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: minor
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: david.hurka at mailbox.org
  Target Milestone: ---

Created attachment 119997
  --> https://bugs.kde.org/attachment.cgi?id=119997&action=edit
Horizontal scroll bar appears although page is narrower than viewport

SUMMARY
When the shown page (or all visible pages) is narrower than the viewport, the
horizontal scroll bar is not needed. *1 But if there are any other pages which
are wider than the viewport, the horizontal scroll bars appears also for the
narrower pages. Toggling Continuous mode has no effect.

STEPS TO REPRODUCE
1. Open a TI datasheet (they have rotated pages): e. g.
http://www.ti.com/lit/gpn/DRV8343-Q1
2. Choose Fit Width --> no horizontal scrollbar
3. Toggle Continuous --> observe: All pages are scaled to same width
4. Zoom out a very little bit (middle mouse button + drag) --> observe: pages
are not scaled to same width anymore.

OBSERVED RESULT
Horizontal scroll bar appears, although page is already narrower than the
viewport.

EXPECTED RESULT
Horizontal scroll bar appears only if the page is wider than the viewport.

If Continuous is enabled, horizontal scroll bars make sense to move the
landscape orientated pages horizontally. But if Continuous is disabled, the
horizontal scroll bar does not make much sense for the portrait pages.

When the horizontal scroll bar appears, it is not possible to advance to the
next page with the right arrow key. In case of TI datasheets, which have only
one or two landscape pages at the end, navigating with left/right arrow keys is
convenient. (Even more as soon as Bug 169614 is fixed.) Of couse, clicking the
Previous/Next Page buttons still works.

Can the horizontal scroll bar / horizontal scrolling funtionality be disabled
if all shown pages are narrower than the viewport?

*1) It is possible to move the landscape pages by dragging a portrait page out
of the viewport, but is this really needed?

SOFTWARE/OS VERSIONS
KDE Neon 5.15
KDE Plasma Version: 5.15.5
KDE Frameworks Version: 5.57.0
Qt Version: 5.12.0
Okular 1.7.0

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