[Konsole-devel] [Bug 204741] New: "Clear Scrollback & Reset" breaks apps using the secondary screen (vim, less)

[Constantin Berzan]

https://bugs.kde.org/show_bug.cgi?id=204741

           Summary: "Clear Scrollback & Reset" breaks apps using the
                    secondary screen (vim, less)
           Product: konsole
           Version: unspecified
          Platform: Ubuntu Packages
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: konsole-devel at kde.org
        ReportedBy: exit3219 at gmail.com


Version:            (using KDE 4.3.0)
OS:                Linux
Installed from:    Ubuntu Packages

The 'Clear Scrollback & Reset' action should be disabled for apps using the
secondary screen. Those apps do not have any scrollback (except what is
immediately visible on the screen).

Currently the action is not disabled, and leads to weird behaviour:

How to reproduce:
Start vim and type something. Konsole's scrollbar doesn't allow scrolling --
this is correct. Now press Ctrl+Shift+X (or Clear & Reset from the Scrollback
menu).  After this, the arrow keys in vim stop working, and the scrollbar
mistakenly begins to allow scrolling.  (I think konsole has just switched to
the primary, scrollable screen).  The only way to fix it is to quit vim and run
/usr/bin/reset.

Similar broken behaviour is visible if one presses Ctrl+Shift+X while using
less.

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