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xcb: fix yet another crash when screens are disconnected 

Can't assume that m_screens is not an empty list.

Task-number: QTBUG-42985
Change-Id: I6f9422638c219123dc898813910d03c7afbd1450
Reviewed-by: Uli Schlachter <psychon@znc.in>
Reviewed-by: Laszlo Agocs <laszlo.agocs@theqtcompany.com>
bb10
Shawn Rutledge 2015-09-04 13:27:48 +02:00
parent 61b608dfb5
commit d72da0b4b2
1 changed files with 4 additions and 2 deletions
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6
src/plugins/platforms/xcb/qxcbconnection.cpp
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@ -1300,10 +1300,12 @@ void QXcbConnection::sendConnectionEvent(QXcbAtom::Atom a, uint id)
memset(&event, 0, sizeof(event));
const xcb_window_t eventListener = xcb_generate_id(m_connection);
xcb_screen_iterator_t it = xcb_setup_roots_iterator(m_setup);
xcb_screen_t *screen = it.data;
Q_XCB_CALL(xcb_create_window(m_connection, XCB_COPY_FROM_PARENT,
eventListener, m_screens.at(0)->root(),
eventListener, screen->root,
0, 0, 1, 1, 0, XCB_WINDOW_CLASS_INPUT_ONLY,
m_screens.at(0)->screen()->root_visual, 0, 0));
screen->root_visual, 0, 0));
event.response_type = XCB_CLIENT_MESSAGE;
event.format = 32;