[konsole] [Bug 477700] Terminal shrinks when creating new/switching tabs on x11

[Milian Wolff]

https://bugs.kde.org/show_bug.cgi?id=477700

--- Comment #20 from Milian Wolff <mail at milianw.de> ---
This code here is enough for me to trigger the behavior - it clearly isn't
konsole specific at all:

```
#include <QApplication>
#include <QTabBar>
#include <QShortcut>
#include <QDebug>
#include <QMainWindow>
#include <QVBoxLayout>
#include <QTabWidget>
#include <QTimer>
#include <QWindow>

int main(int argc, char** argv)
{
    QApplication app(argc, argv);

    QMainWindow window;

    auto center = new QTabWidget;
    window.setCentralWidget(center);

    auto tab = center->tabBar();

    auto addTab = [tab]() {
        static int counter = 0;
        tab->addTab(QString::number(counter++));
        qWarning() << "add" << counter;
    };
    addTab();

    auto removeTab = [tab]() {
        tab->removeTab(tab->currentIndex());
        qWarning() << "rem";
    };

    auto newTab = new QShortcut(QKeySequence::New, tab);
    qWarning() << newTab->key();
    newTab->setContext(Qt::ApplicationShortcut);
    QObject::connect(newTab, &QShortcut::activated, tab, addTab);

    auto closeTab = new QShortcut(QKeySequence::Close, tab);
    qWarning() << closeTab->key();
    closeTab->setContext(Qt::ApplicationShortcut);
    QObject::connect(closeTab, &QShortcut::activated, tab, removeTab);

    window.resize(600, 400);
    window.show();

    QObject::connect(window.windowHandle(), &QWindow::heightChanged, &window,
[&](int height) {
        qWarning() << "height changed:" << height;
    });

    if (app.arguments().contains("--auto")) {
        auto timer = new QTimer(tab);
        timer->setInterval(100);
        QObject::connect(timer, &QTimer::timeout, &app, [&]() {
            static int i = 0;
            if ((i % 2) == 0)
                removeTab();
            else
                addTab();
            ++i;
        });
        timer->start();
    }

    return app.exec();
}
```

Example output when run:

```
./tab --auto
     0.000 warning: main(int,
char**)::<lambda[/home/milian/projects/bugs/tab/tab.cpp:25]: add 1
     0.000 warning: main[/home/milian/projects/bugs/tab/tab.cpp:35]:
QKeySequence("Ctrl+N")
     0.000 warning: main[/home/milian/projects/bugs/tab/tab.cpp:40]:
QKeySequence("Ctrl+W")
     0.040 warning: main(int,
char**)::<lambda[/home/milian/projects/bugs/tab/tab.cpp:48]: height changed:
399
     0.111 warning: main(int,
char**)::<lambda[/home/milian/projects/bugs/tab/tab.cpp:31]: rem
     0.207 warning: main(int,
char**)::<lambda[/home/milian/projects/bugs/tab/tab.cpp:25]: add 2
     0.210 warning: main(int,
char**)::<lambda[/home/milian/projects/bugs/tab/tab.cpp:48]: height changed:
398
     0.302 warning: main(int,
char**)::<lambda[/home/milian/projects/bugs/tab/tab.cpp:31]: rem
     0.305 warning: main(int,
char**)::<lambda[/home/milian/projects/bugs/tab/tab.cpp:48]: height changed:
397
     0.397 warning: main(int,
char**)::<lambda[/home/milian/projects/bugs/tab/tab.cpp:25]: add 3
     0.492 warning: main(int,
char**)::<lambda[/home/milian/projects/bugs/tab/tab.cpp:31]: rem
     0.494 warning: main(int,
char**)::<lambda[/home/milian/projects/bugs/tab/tab.cpp:48]: height changed:
396
     0.587 warning: main(int,
char**)::<lambda[/home/milian/projects/bugs/tab/tab.cpp:25]: add 4
     0.590 warning: main(int,
char**)::<lambda[/home/milian/projects/bugs/tab/tab.cpp:48]: height changed:
395
     0.686 warning: main(int,
char**)::<lambda[/home/milian/projects/bugs/tab/tab.cpp:31]: rem
     0.787 warning: main(int,
char**)::<lambda[/home/milian/projects/bugs/tab/tab.cpp:25]: add 5
     0.791 warning: main(int,
char**)::<lambda[/home/milian/projects/bugs/tab/tab.cpp:48]: height changed:
394
     0.887 warning: main(int,
char**)::<lambda[/home/milian/projects/bugs/tab/tab.cpp:31]: rem
     0.890 warning: main(int,
char**)::<lambda[/home/milian/projects/bugs/tab/tab.cpp:48]: height changed:
393
     0.987 warning: main(int,
char**)::<lambda[/home/milian/projects/bugs/tab/tab.cpp:25]: add 6
```

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