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[PATCH] xcb: add a timeout control when reading INCR property 

For the first call of QXcbClipboard::clipboardReadProperty()
inside of clipboardReadIncrementalProperty() in getSelection(),
it will get a XCB_NONE reply before the contents arrived via
property change. Then we give a chance to read more.

Manually tested with following setups:
* examples/widgets/mainwindows/application with gvim(gtk3)
* examples/widgets/widgets/imageviewer with GIMP 2.10.18(based on
gtk2) and GIMP 2.99.6(based on gtk3 via flatpak)

Fixes: QTBUG-56595
Pick-to: 5.12 5.15 6.1 6.2
Done-With: JiDe Zhang <zhangjide@uniontech.com>
Change-Id: Ib45f08464d39ad79137b1da99808c89b7dca2d08
Reviewed-by: JiDe Zhang <zhangjide@uniontech.com>
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

Gbp-Pq: Name xcb_add_a_timeout_control_when_reading_INCR_property.diff
This commit is contained in:
Liang Qi 2021-07-07 13:19:14 +02:00 committed by openKylinBot
parent 96f1345c14
commit fdd828e560
1 changed files with 6 additions and 2 deletions
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8
src/plugins/platforms/xcb/qxcbclipboard.cpp
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@ -835,6 +835,8 @@ QByteArray QXcbClipboard::clipboardReadIncrementalProperty(xcb_window_t win, xcb
alloc_error = buf.size() != nbytes+1;
}
QElapsedTimer timer;
timer.start();
for (;;) {
connection()->flush();
xcb_generic_event_t *ge = waitForClipboardEvent(win, XCB_PROPERTY_NOTIFY);
@ -870,9 +872,11 @@ QByteArray QXcbClipboard::clipboardReadIncrementalProperty(xcb_window_t win, xcb
tmp_buf.resize(0);
offset += length;
}
} else {
break;
}
const auto elapsed = timer.elapsed();
if (elapsed > clipboard_timeout)
break;
}
// timed out ... create a new requestor window, otherwise the requestor