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Details

Type: Bug
Resolution: Fixed
Priority: P2: Important
Fix Version/s: 6.8.3, 6.9.0 Beta3, 6.10.0 FF
Affects Version/s: 5.15.9, 6.5.0
Component/s: Widgets: Widgets and Dialogs
Labels:
None

Platform/s:

Linux/X11, Windows
Commits:
e6e210c24 (dev), 34167f662 (6.9), b4dd1ac67 (6.8)

Description

In a QMdiArea instance with a TabbedView mode, movable and closable tabs, and multiple tabs (3 or more) after moving the tab (by dragging the user or via QTabBar::moveTab) the following is observed:

after closing the current moved tab (without switching to others), all tabs are minimized without switching to the next one (seems like SubWindowView mode).
after moving the tab and deactivating the application (for example, minimizing the application), and then further activation, it automatically switches to the tab with the old index.

I have my own workaround with connecting private header (private/qmdiarea_p.h): updating indicesToActivatedChildren:

connect(findChild<QTabBar*>(), &QTabBar::tabMoved, this, [this](int from, int to)
{
    if (auto d = dynamic_cast<QMdiAreaPrivate*>(qGetPtrHelper(d_ptr))) {
        auto& indiciesActivatedSeq = d->indicesToActivatedChildren;
        if (int size = indiciesActivatedSeq.size();
            from >= 0 && from < size && to >= 0 && to < size) {
            bool forward = from < to;
            int step = forward ? 1 : -1;
            std::function<bool(int, int)> comp = forward ?
                std::function(std::less_equal<int>()) :
                std::function(std::greater_equal<int>());
            const int fromIndex = indiciesActivatedSeq.indexOf(from);
            indiciesActivatedSeq[fromIndex] = -1;
            for (int i = from + step; comp(i, to); i += step)
            	indiciesActivatedSeq[indiciesActivatedSeq.indexOf(i)] -= step;
            indiciesActivatedSeq[fromIndex] = to;
        }
    }
});