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[x11] Send a valid timestamp in TakeFocus messages

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Kwin sends out undated WM_TAKE_FOCUS client messages. Gtk based
applications such as Firefox react to these by handing focus to one of
their subwindows using XSetInputFocus(), and pass on the null time field
that they received in the client message to XSetInputFocus().

If for whatever reason the application (firefox) is slow to process the
event, it might issue that XSetInputFocus() message at a time when it
has already lost focus to the next application. This results in Firefox
stealing back the focus from the next application. Normally, such an
occurrence would not happen, as the server could tell by the time field
that the message is stale.

Until 2016 (e73e331f35) kwin *used* to
send a valid timestamp, but this got deliberately broken to appease some
Java Applications which were "extremely picky" and would refuse focus.

This was based on the assumption that no other toolkit used the
timestamp from take focus events which is now proven to be false.

ICCCM document states:

Windows with the atom WM_TAKE_FOCUS in their WM_PROTOCOLS property may
receive  a ClientMessage event from the window manager (as described in
section 4.2.8) with WM_TAKE_FOCUS in its data[0] field and a valid
timestamp (i.e. not CurrentTime ) in its data[1] field."

BUG: 421068
This commit is contained in:
Alain Knaff 2020-05-22 13:56:20 +01:00 committed by David Edmundson
parent c890996a33
commit e9c68f36bd
2 changed files with 5 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

7
x11client.cpp
View file

@ -1705,7 +1705,7 @@ void X11Client::updateHiddenPreview()
}
}
void X11Client::sendClientMessage(xcb_window_t w, xcb_atom_t a, xcb_atom_t protocol, uint32_t data1, uint32_t data2, uint32_t data3, xcb_timestamp_t timestamp)
void X11Client::sendClientMessage(xcb_window_t w, xcb_atom_t a, xcb_atom_t protocol, uint32_t data1, uint32_t data2, uint32_t data3)
{
xcb_client_message_event_t ev;
memset(&ev, 0, sizeof(ev));
@ -1714,7 +1714,7 @@ void X11Client::sendClientMessage(xcb_window_t w, xcb_atom_t a, xcb_atom_t proto
ev.type = a;
ev.format = 32;
ev.data.data32[0] = protocol;
ev.data.data32[1] = timestamp;
ev.data.data32[1] = xTime();
ev.data.data32[2] = data1;
ev.data.data32[3] = data2;
ev.data.data32[4] = data3;
@ -2029,7 +2029,8 @@ void X11Client::takeFocus()
else
demandAttention(false); // window cannot take input, at least withdraw urgency
if (info->supportsProtocol(NET::TakeFocusProtocol)) {
sendClientMessage(window(), atoms->wm_protocols, atoms->wm_take_focus, 0, 0, 0, XCB_CURRENT_TIME);
updateXTime();
sendClientMessage(window(), atoms->wm_protocols, atoms->wm_take_focus);
}
workspace()->setShouldGetFocus(this);

3
x11client.h
View file

@ -426,8 +426,7 @@ private:
void killProcess(bool ask, xcb_timestamp_t timestamp = XCB_TIME_CURRENT_TIME);
void updateUrgency();
static void sendClientMessage(xcb_window_t w, xcb_atom_t a, xcb_atom_t protocol,
uint32_t data1 = 0, uint32_t data2 = 0, uint32_t data3 = 0,
xcb_timestamp_t timestamp = xTime());
uint32_t data1 = 0, uint32_t data2 = 0, uint32_t data3 = 0);
void embedClient(xcb_window_t w, xcb_visualid_t visualid, xcb_colormap_t colormap, uint8_t depth);
void detectNoBorder();