[konsole] [Bug 443113] New: Shortcuts sent through to terminal

[Henrik Pauli]

https://bugs.kde.org/show_bug.cgi?id=443113

            Bug ID: 443113
           Summary: Shortcuts sent through to terminal
           Product: konsole
           Version: 20.12.2
          Platform: Fedora RPMs
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: keyboard
          Assignee: konsole-devel at kde.org
          Reporter: henrik.pauli at gmail.com
  Target Milestone: ---

I have the Next Tab and Previous Tab set to Ctrl+PageDown and Ctrl+PageUp,
respectively.  These work just fine, most of the time.

However, in some situations the keypress is sent to the terminal component.

```
$ cat
^[[6;5~^[[5;5~
```

Some testing showed that this happens on a brand new window, if – and only if –
there has only been one tab in that window ever.  Put differently: if you open
a tab in this window, the shortcut handler will get installed and closing the
tab so only one tab remains will retain the handler and no rogue keycodes are
sent to the terminal.

STEPS TO REPRODUCE

(A)
1. Open a new Konsole window
2. Press tab-cycling shortcuts

Then (B)
1. Open a new Konsole window
2. Open an extra tab
3. Press tab-cycling shortcuts
4. Close the extra tab
5. Press tab-cycling shortcuts

OBSERVED RESULT
(A) the terminal will print the keypresses (if it's such that it translates
well; you may want to run cat, or something)
(B) the terminal will not print

EXPECTED RESULT
(A) 3. and (B) 5. should behave identically, in particular the way that (B) 5.
does.

SOFTWARE/OS VERSIONS
Konsole: 20.12.2
Running MATE 1.24.1
KDE Frameworks 5.79.0
Qt 5.15.2 (built against 5.15.2)
The xcb windowing system

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