[okular] [Bug 408075] New: Okular flips pages if history is exhausted while using the back / forward keyboard shortcuts

[Kishore Gopalakrishnan]

https://bugs.kde.org/show_bug.cgi?id=408075

            Bug ID: 408075
           Summary: Okular flips pages if history is exhausted while using
                    the back / forward keyboard shortcuts
           Product: okular
           Version: 1.7.1
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: kishore96 at gmail.com
  Target Milestone: ---

SUMMARY
Okular binds the alt+shift+left/right shortcuts to the 'back' and 'forward'
items by default. If the history is exhausted (i.e. we navigate back/forward
till there are no more locations left), okular starts moving to the
next/previous page, acting as if we have pressed just the left/right arrow key.

STEPS TO REPRODUCE
1. Open a PDF in Okular.
2. Add the back and forward buttons to the toolbar (this is just to illustrate
the issue)
3. Note that the 'forward' button is greyed out.
4. Press Alt+Shift+Right (forward). 
5. Note that Okular moves forward one page.
6. Now scroll up and down to populate the history.
7. Press Alt+Shift+Left until the history of previous locations is exhausted.
At this point, the 'back' button will be greyed out and unclickable.
8. Press Alt+Shift+Left
8. Note that this causes Okular to move one page back (as if we had just
pressed the left arrow key)

OBSERVED RESULT
Okular flips pages when there is nowhere to go to in the history.

EXPECTED RESULT
Okular should do nothing if history is exhausted (i.e. after steps 8 and 4).

SOFTWARE/OS VERSIONS
Linux distro: Arch Linux
KDE Plasma Version: 5.15.90
KDE Frameworks Version: 5.58.0
Qt Version: 5.13.0

ADDITIONAL INFORMATION
This is reproducible only if the shortcut contains an arrow key. If we bind
something like ctrl+9 to 'forward', Okular shows the expected behaviour. Prima
facie, it looks like Okular doesn't correctly handle the keypresses
corresponding to a shortcut if the shortcut corresponds to an action that
cannot be performed (like going 'forward' when we are at the most recently
veiwed location).

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