Bug 305590

FreeCAD causes a 100% cpu load in conjunction with Oxygen. Confirmed in irc channel. See additional information for test case and this link:
https://sourceforge.net/apps/phpbb/free-cad/viewtopic.php?f=4&t=2815

Reproducible: Always




[quote="wmayer"]Here is a test application that shows that it's clearly not a FreeCAD bug but KDE/oxygen issue:

main.cpp
[code]

/**
 * This test application demonstrates a bug with KDE that happens if all of these points are fulfilled:
 * 1. Using KDE desktop environment
 * 2. Using Oxygen windows style
 * 3. Enabling the tab bar of QMdiArea
 * 4. Maximaize the main window after start 
 */

#include <QtCore>
#include <QtGui>
#include <QtWebKit>

class GUIApplication : public QApplication
{
public:
    GUIApplication(int & argc, char ** argv)
        : QApplication(argc, argv)
    {
    }

    bool notify (QObject * receiver, QEvent * event)
    {
        int type = event->type();
        if (type != 113 && type != 1)
            printf("Event type %d\n", type);
        return QApplication::notify(receiver, event);
    }
};

int main(int argc, char** argv)
{
    GUIApplication app(argc, argv);
    QMainWindow mw;
    mw.show();
    QMdiArea* mdiArea = new QMdiArea();
    mdiArea->setTabPosition(QTabWidget::South);
    // Having the tabbar enabled casuses a full CPU load later when resizing
    mdiArea->setViewMode(QMdiArea::TabbedView);
    mdiArea->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
    mdiArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);
    mdiArea->setOption(QMdiArea::DontMaximizeSubWindowOnActivation, false);
    mdiArea->setActivationOrder(QMdiArea::ActivationHistoryOrder);
    mw.setCentralWidget(mdiArea);
    
    QMainWindow* view = new QMainWindow(&mw);
    QWebView* web = new QWebView(view);
    view->setCentralWidget(web);
    web->load(QUrl("http://www.heise.de"));

    QMdiSubWindow* child = new QMdiSubWindow(mdiArea->viewport());
    child->setAttribute(Qt::WA_DeleteOnClose);
    child->setWidget(view);
    mdiArea->addSubWindow(child);
    view->showMaximized();
    
    
    return app.exec();
}
[/code]

test.pro
[code]
TEMPLATE = app
TARGET = 
DEPENDPATH += .
INCLUDEPATH += .
QT += webkit

# Input
SOURCES += main.cpp
[/code][/quote]