Hi all,

i am maintaining a Qt4 application, since updating my desktop to KDE5 (plasma5) i experience strange issues with marking text for cut&paste.

Issue is as following.


When i mark some text with the mouse in the Qt4 based application (the application displays a webpage with the use of QtWebPage and QtWebView) the KDE5 plasma system tray get stuck for around 30 seconds e.g. clicking on a icon does not work, clicking on a different task does not work, clicking the menu button does not work etc. However switching tasks via ALT+tab does all times work perfectly. So it looks like only the system tray is affected.

I debugged the issue down to following call in the application

- The application window uses QtWebPage
- inside QTWebPage object a QtWebView object is used to create the view for the webpage.
- The QtWebView has a mouse event handler

Qt Code: 
  1. void Browser::mousePressEvent( QMouseEvent* event ) {
  2.     StatusBar::hideDownloadManager();
  3.  
  4.     if ( ( event->button() == 2 ) &&
  5.          ( mPage->loggedIn() ) )
  6.     {
  7.         contextMenu( event, mPage->currentSr() );
  8.         //qDebug() << mPage->getElementText( element.attribute("id") );
  9.     }
  10.  
  11.     if ( ( event->button() == 4 ) && 
  12.          ( mPage->loggedIn() ) &&
  13.          ( mPage->getElementAt( event->pos() ).element().attribute( "type" ) != "input" ) &&
  14.          ( mPage->getElementAt( event->pos() ).element().attribute( "type" ) != "text" )  &&
  15.          ( !isTextArea( mPage->getElementAt( event->pos() ).element() ) ) &&
  16.          ( MainApp::isSrNr( MainApp::getClipboard() ) ) )
  17.     {
  18.         querySR( MainApp::getClipboard().trimmed() );
  19.     }
  20.     QWebView::mousePressEvent( event );
  21. }
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When i comment out everything EXPECT

Qt Code: 
  1. QWebView::mousePressEvent( event );
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the issue still happens.

If only commented out the line

Qt Code: 
  1. QWebView::mousePressEvent( event );
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the issue does not show up, hover mouse clicks are not recognized anymore.

So i believe the issue must be related to QWebView::mousePressEvent. Is there something i can check/debug this to track down the issue ?

Thanks for any help/hint.

regards,
Tami