In brief, sometimes scim is blocked to receive new key events.
The detailed descriptions are here:
https://bugs.freedesktop.org/show_bug.cgi?id=7869The problem happens when scim is working in XIM mode.
I think it is a bug of XIM client or XIM protocol itself.
Anyway, I found a way to work around the bug.
It is to reset all the sync flag and remove the queue, when the focus
is changing.
I made a patch, which is attached.
Please review it.
[scim-xim-block.patch]
Index: modules/FrontEnd/IMdkit/i18nPtHdr.c
===================================================================
--- modules/FrontEnd/IMdkit/i18nPtHdr.c (revision 56)
+++ modules/FrontEnd/IMdkit/i18nPtHdr.c (working copy)
@@ -53,6 +53,38 @@
extern Xi18nClient *_Xi18nFindClient (Xi18n, CARD16);
+static void DiscardQueue (XIMS ims, CARD16 connect_id)
+{
+ Xi18n i18n_core = ims->protocol;
+ Xi18nClient *client = (Xi18nClient *) _Xi18nFindClient (i18n_core,
+ connect_id);
+
+ if (client != NULL) {
+ client->sync = False;
+ while (client->pending != NULL) {
+ XIMPending* pending = client->pending;
+
+ client->pending = pending->next;
+
+ XFree(pending->p);
+ XFree(pending);
+ }
+ }
+}
+
+static void DiscardAllQueue(XIMS ims)
+{
+ Xi18n i18n_core = ims->protocol;
+ Xi18nClient* client = i18n_core->address.clients;
+
+ while (client != NULL) {
+ if (client->sync) {
+ DiscardQueue(ims, client->connect_id);
+ }
+ client = client->next;
+ }
+}
+
static void GetProtocolVersion (CARD16 client_major,
CARD16 client_minor,
CARD16 *server_major,
@@ -866,6 +898,21 @@
CARD16 connect_id = call_data->any.connect_id;
CARD16 input_method_ID;
+ /* some buggy xim clients do not send XIM_SYNC_REPLY for synchronous
+ * events. In such case, xim server is waiting for XIM_SYNC_REPLY
+ * forever. So the xim server is blocked to waiting sync reply.
+ * It prevents further input.
+ * Usually it happens when a client calls XSetICFocus() with another ic
+ * before passing an event to XFilterEvent(), where the event is needed
+ * by the old focused ic to sync its state.
+ * To avoid such problem, remove the whole clients queue and set them
+ * as asynchronous.
+ *
+ * See:
+ * http://bugs.freedesktop.org/show_bug.cgi?id=7869
+ */
+ DiscardAllQueue(ims);
+
setfocus = (IMChangeFocusStruct *) &call_data->changefocus;
fm = FrameMgrInit (set_ic_focus_fr,
@@ -897,7 +944,18 @@
IMChangeFocusStruct *unsetfocus;
CARD16 connect_id = call_data->any.connect_id;
CARD16 input_method_ID;
+ Xi18nClient *client = _Xi18nFindClient (i18n_core, connect_id);
+ /* some buggy clients unset focus ic before the ic answer the sync reply,
+ * so the xim server may be blocked to waiting sync reply. To avoid
+ * this problem, remove the client queue and set it asynchronous
+ *
+ * See: SetICFocusMessageProc
+ */
+ if (client != NULL && client->sync) {
+ DiscardQueue(ims, client->connect_id);
+ }
+
unsetfocus = (IMChangeFocusStruct *) &call_data->changefocus;
fm = FrameMgrInit (unset_ic_focus_fr,
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