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x11: Let selection input streams create their own window

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When there are two (or more) concurrent XConvertSelection requests with
the same target, selection and window and the data is large enough for
SelectionNotify events to overlap. This can result in the affected streams
being considered completed without any data being transferred.

While regular mutter/shell code does not make use of concurrent
XConvertSelection requests with the same targets, some extensions might.
Such as for example a clipboard manager that like the built-in clipboard
manager tries to read the selection on owner-changed.

One potential solution would be to make sure the event is for the correct
property, but not all clients seem to support concurrent requests for the
same targets but different properties on the same window.

This commit instead changes the streams to use their own window which
seems to be more widely supported.

Fixes https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/4034

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1812>
This commit is contained in:
Sebastian Keller 2021-04-05 01:06:38 +02:00
parent d25175b91c
commit dbd6e74d3c
3 changed files with 17 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/x11/meta-selection-source-x11.c
View File

@ -92,7 +92,6 @@ meta_selection_source_x11_read_async (MetaSelectionSource *source,
mimetype = "UTF8_STRING";
meta_x11_selection_input_stream_new_async (source_x11->x11_display,
source_x11->x11_display->selection.xwindow,
gdk_x11_get_xatom_name (source_x11->xselection),
mimetype,
source_x11->timestamp,
@ -251,7 +250,6 @@ meta_selection_source_x11_new_async (MetaX11Display *x11_display,
g_task_set_task_data (task, source, g_object_unref);
meta_x11_selection_input_stream_new_async (x11_display,
x11_display->selection.xwindow,
gdk_x11_get_xatom_name (xselection),
"TARGETS",
timestamp,

1
src/x11/meta-x11-selection-input-stream-private.h
View File

@ -33,7 +33,6 @@ G_DECLARE_FINAL_TYPE (MetaX11SelectionInputStream,
GInputStream)
void meta_x11_selection_input_stream_new_async (MetaX11Display *x11_display,
Window window,
const char *selection,
const char *target,
guint32 timestamp,

20
src/x11/meta-x11-selection-input-stream.c
View File

@ -287,6 +287,7 @@ meta_x11_selection_input_stream_finalize (GObject *object)
META_X11_SELECTION_INPUT_STREAM (object);
MetaX11SelectionInputStreamPrivate *priv =
meta_x11_selection_input_stream_get_instance_private (stream);
Display *xdisplay = priv->x11_display->xdisplay;
g_async_queue_unref (priv->chunks);
@ -294,6 +295,8 @@ meta_x11_selection_input_stream_finalize (GObject *object)
g_free (priv->target);
g_free (priv->property);
XDestroyWindow (xdisplay, priv->window);
G_OBJECT_CLASS (meta_x11_selection_input_stream_parent_class)->finalize (object);
}
@ -504,7 +507,6 @@ meta_x11_selection_input_stream_xevent (MetaX11SelectionInputStream *stream,
void
meta_x11_selection_input_stream_new_async (MetaX11Display *x11_display,
Window window,
const char *selection,
const char *target,
guint32 timestamp,
@ -515,10 +517,14 @@ meta_x11_selection_input_stream_new_async (MetaX11Display *x11_display,
{
MetaX11SelectionInputStream *stream;
MetaX11SelectionInputStreamPrivate *priv;
XSetWindowAttributes attributes = { 0 };
stream = g_object_new (META_TYPE_X11_SELECTION_INPUT_STREAM, NULL);
priv = meta_x11_selection_input_stream_get_instance_private (stream);
attributes.event_mask = PropertyChangeMask;
attributes.override_redirect = True;
priv->x11_display = x11_display;
x11_display->selection.input_streams =
g_list_prepend (x11_display->selection.input_streams, stream);
@ -528,13 +534,21 @@ meta_x11_selection_input_stream_new_async (MetaX11Display *x11_display,
priv->xtarget = XInternAtom (x11_display->xdisplay, priv->target, False);
priv->property = g_strdup_printf ("META_SELECTION_%p", stream);
priv->xproperty = XInternAtom (x11_display->xdisplay, priv->property, False);
priv->window = window;
priv->window = XCreateWindow (x11_display->xdisplay,
x11_display->xroot,
-1, -1, 1, 1,
0, /* border width */
0, /* depth */
InputOnly, /* class */
CopyFromParent, /* visual */
CWEventMask | CWOverrideRedirect,
&attributes);
XConvertSelection (x11_display->xdisplay,
priv->xselection,
priv->xtarget,
priv->xproperty,
window,
priv->window,
timestamp);
priv->pending_task = g_task_new (NULL, cancellable, callback, user_data);