Created attachment 160445 [details]
Screenshot showing theme selection dialog window (normal)

SUMMARY
The theme selection dialog window is not resizable and too large to fit on a 14" screen with 30px of panel which is always visible. The amount of information in this window actually doesn't require the whole space. The minimum size is too large and this doesn't allow the user to see the buttons. Screenshots are attached. Note that a standard KDE layout might face even more issues since the title bar is hidden during maximize in my layout. Checking the code, I found that this is the relevant part of the code:

```
src/theme/themselectiondialog.cpp, line 101 onwards:
    // Find view sizes
    int focush = style()->pixelMetric(QStyle::PM_FocusFrameHMargin);
    int focusv = style()->pixelMetric(QStyle::PM_FocusFrameVMargin);
    int frame = style()->pixelMetric(QStyle::PM_DefaultFrameWidth);
    int scrollbar = style()->pixelMetric(QStyle::PM_SliderThickness) +
                    style()->pixelMetric(QStyle::PM_ScrollBarExtent);
    const int spacing = 10;
    const int rowCount = 3;
    const int columnCount = 3;
    QSize viewSize
    (
        ((d->iconWidth + frame + focush + (spacing * 2)) * columnCount) + scrollbar,
        (d->iconHeight + fontMetrics().height() + frame + focusv + (spacing * 2)) * rowCount
    );
...
    d->themeListWidget->setMinimumSize(viewSize);

```

STEPS TO REPRODUCE
1. 
2. 
3. 

OBSERVED RESULT


EXPECTED RESULT


SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux
(available in About System)
KDE Plasma Version: 5.27.6
KDE Frameworks Version: 5.108.0
Qt Version: 5.15.10
Graphics Platform: Wayland

ADDITIONAL INFORMATION