[konsole] [Bug 445550] New: Frequent SIGSEGV just after rebasing on `master`

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=445550

            Bug ID: 445550
           Summary: Frequent SIGSEGV just after rebasing on `master`
           Product: konsole
           Version: master
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: konsole-devel at kde.org
          Reporter: personalizedrefrigerator at gmail.com
  Target Milestone: ---

SUMMARY

>From `gdb`:
```
Reading symbols from konsole...
(gdb) r
Starting program: /usr/bin/konsole 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[New Thread 0x7ffff08d1640 (LWP 9957)]
[New Thread 0x7fffea36a640 (LWP 9958)]
[Detaching after fork from child process 9959]
qt.qpa.wayland: setGrabPopup called with a parent,
QtWaylandClient::QWaylandXdgSurface(0x555555a8d310) which does not match the
current topmost grabbing popup,
QtWaylandClient::QWaylandXdgSurface(0x555555ed6e10) According to the xdg-shell
protocol, this is not allowed. The wayland QPA plugin is currently handling it
by setting the parent to the topmost grabbing popup. Note, however, that this
may cause positioning errors and popups closing unxpectedly because xdg-shell
mandate that child popups close before parents

[... after about 1 minute, while scrolling down in `vim`]

Thread 1 "konsole" received signal SIGSEGV, Segmentation fault.
0x00007ffff7cff3fc in
std::__fill_a1<QTypedArrayData<Konsole::Character>::iterator,
Konsole::Character> (__first=..., __last=..., __value=...) at
/usr/include/c++/11.1.0/bits/stl_algobase.h:912
912             *__first = __value;
(gdb) bt full
#0  0x00007ffff7cff3fc in
std::__fill_a1<QTypedArrayData<Konsole::Character>::iterator,
Konsole::Character> (__first=..., __last=..., __value=...)
    at /usr/include/c++/11.1.0/bits/stl_algobase.h:912
No locals.
#1  0x00007ffff7cfd5b3 in
std::__fill_a<QTypedArrayData<Konsole::Character>::iterator,
Konsole::Character> (__first=..., __last=..., __value=...)
    at /usr/include/c++/11.1.0/bits/stl_algobase.h:969
No locals.
#2  0x00007ffff7cfa65c in
std::fill<QTypedArrayData<Konsole::Character>::iterator, Konsole::Character>
(__first=..., __last=..., __value=...)
    at /usr/include/c++/11.1.0/bits/stl_algobase.h:999
No locals.
#3  0x00007ffff7cf500c in Konsole::Screen::clearImage (this=0x555555896c30,
loca=4302, 
    loce=4319, c=32 ' ', resetLineRendition=false)
    at /home/hematite/Documents/Build/konsole/src/Screen.cpp:1132
        endCol = 89
        startCol = 72
        line = @0x55555592a048: {d = 0x555555d88340}
        y = 47
        scr_TL = 0
        topLine = 47
        bottomLine = 47
        clearCh = {character = 32, rendition = 0, foregroundColor = {
            _colorSpace = 1 '\001', _u = 0 '\000', _v = 0 '\000', _w = 0
'\000'}, 
          backgroundColor = {_colorSpace = 1 '\001', _u = 1 '\001', _v = 0
'\000', 
            _w = 0 '\000'}, isRealCharacter = false}
        isDefaultCh = true
#4  0x00007ffff7cf5781 in Konsole::Screen::clearToEndOfLine
(this=0x555555896c30)
    at /home/hematite/Documents/Build/konsole/src/Screen.cpp:1248
No locals.
#5  0x00007ffff7d1d08a in Konsole::Vt102Emulation::processToken
(this=0x55555594f6d0, 
    token=19205, p=0, q=0)
    at /home/hematite/Documents/Build/konsole/src/Vt102Emulation.cpp:692
No locals.
#6  0x00007ffff7d1a80f in Konsole::Vt102Emulation::receiveChar
(this=0x55555594f6d0, 
    cc=75) at /home/hematite/Documents/Build/konsole/src/Vt102Emulation.cpp:474
        i = 0
        s = 0x55555594f768
        p = 3
#7  0x00007ffff7cd8f04 in Konsole::Emulation::receiveData (this=0x55555594f6d0, 
    text=0x55555609f688 " ", length=332)
    at /home/hematite/Documents/Build/konsole/src/Emulation.cpp:238
        i = 75
        __for_range = @0x7fffffffd520: {d = 0x555556022050}
        __for_begin = {i = 0x55555602250c}
```


STEPS TO REPRODUCE
1. Open `vim`
2. Run `:help`
3. Scroll up and down
4. Open and close the `settings` menu
5. Scroll up and down in `:help`
6. Quit `vim` and open the right-click menu
7. Continue to use `vim`/`konsole` for several minutes

OBSERVED RESULT
Konsole crashes

EXPECTED RESULT
Konsole should not crash

SOFTWARE/OS VERSIONS
Linux/KDE Plasma:  Manjaro/Plasma (Wayland)
KDE Plasma Version: 5.22.5
KDE Frameworks Version: 5.87.0 (Konsole built from source)
Qt Version: 5.15.2

ADDITIONAL INFORMATION
The crashing seems random, but I'm getting the same backtrace each time.

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