[Bug 142010] New: Repainting takes too long in when filtering for unread messages

[Dima Ryazanov]

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http://bugs.kde.org/show_bug.cgi?id=142010         
           Summary: Repainting takes too long in when filtering for unread
                    messages
           Product: kontact
           Version: unspecified
          Platform: Gentoo Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: kdepim-bugs kde org
        ReportedBy: someone berkeley edu


Version:            (using KDE KDE 3.5.6)
Installed from:    Gentoo Packages
Compiler:          gcc (GCC) 4.1.1 (Gentoo 4.1.1-r3) 
OS:                Linux

I have 10354 email messages in one of the folders, with 113 of them unread. If I tell Kontact to display only the messages with the "Unread" status, and scroll to the very top to see the first one, it takes about 5-10 seconds to display the list. (Happens for any "paint" event - when scrolling, moving another window on top of Kontact, etc.)

If the first message is not visible, everything works fast. If all messages are displayed, or only the ones with attachments, it's also fine.

The delay decreases if I decreases the number of messages. With 4000 messages, it's almost unnoticeable.

Backtrace during the delay:

#0  0xb6a1ffbb in QListViewItem::itemAbove () from /usr/qt/3/lib/libqt-mt.so.3
#1  0xb71f14fb in KListViewItem::isAlternate () from /usr/kde/3.5/lib/libkdeui.so.4
#2  0xb71f17af in KListViewItem::backgroundColor () from /usr/kde/3.5/lib/libkdeui.so.4
#3  0xb71f1a73 in KListViewItem::paintCell () from /usr/kde/3.5/lib/libkdeui.so.4
#4  0xb585e564 in KMail::HeaderItem::paintCell () from /usr/kde/3.5/lib/libkmailprivate.so
#5  0xb6a29df1 in QListView::drawContentsOffset () from /usr/qt/3/lib/libqt-mt.so.3
#6  0xb6a559bf in QScrollView::viewportPaintEvent () from /usr/qt/3/lib/libqt-mt.so.3
#7  0xb71f319a in KListView::viewportPaintEvent () from /usr/kde/3.5/lib/libkdeui.so.4
#8  0xb6a5676f in QScrollView::eventFilter () from /usr/qt/3/lib/libqt-mt.so.3
#9  0xb6a25656 in QListView::eventFilter () from /usr/qt/3/lib/libqt-mt.so.3
#10 0xb584e689 in KMHeaders::eventFilter () from /usr/kde/3.5/lib/libkmailprivate.so
#11 0xb69448ac in QObject::activate_filters () from /usr/qt/3/lib/libqt-mt.so.3
#12 0xb694491b in QObject::event () from /usr/qt/3/lib/libqt-mt.so.3
#13 0xb697cf8c in QWidget::event () from /usr/qt/3/lib/libqt-mt.so.3
#14 0xb68e6457 in QApplication::internalNotify () from /usr/qt/3/lib/libqt-mt.so.3
#15 0xb68e6fd1 in QApplication::notify () from /usr/qt/3/lib/libqt-mt.so.3
#16 0xb6ee62de in KApplication::notify () from /usr/kde/3.5/lib/libkdecore.so.4
#17 0xb687a762 in QETWidget::translatePaintEvent () from /usr/qt/3/lib/libqt-mt.so.3
#18 0xb688614b in QApplication::x11ProcessEvent () from /usr/qt/3/lib/libqt-mt.so.3
#19 0xb689693a in QEventLoop::processEvents () from /usr/qt/3/lib/libqt-mt.so.3
#20 0xb68fcb50 in QEventLoop::enterLoop () from /usr/qt/3/lib/libqt-mt.so.3
#21 0xb68fc9d6 in QEventLoop::exec () from /usr/qt/3/lib/libqt-mt.so.3
#22 0xb68e5eef in QApplication::exec () from /usr/qt/3/lib/libqt-mt.so.3
#23 0x08058aac in ?? ()
#24 0xbfae4988 in ?? ()
#25 0x00000001 in ?? ()
#26 0x00000001 in ?? ()
#27 0x00000000 in ?? ()