Remove the wait for the ibus daemon to start

[matt335672]

Fixes #3080 and tested by @seflerZ

The initial implementation of Uinicode input via IBus used a startup delay of 3 seconds to wait for the daemon to be ready before connecting to it.

This commit introduces a poll-wait loop which can remove the delay entirely if the daemon is up when chansrv starts the interface.

[seflerZ]

I think we can increase the timeout a little longer, such as 3-5 seconds. Longer timeout has no side effects because it will end as soon as the iBus is ready. We can cover 99.99%+ computers for that.

[matt335672]

@seflerZ - I think the timeout is 5 seconds with the above (10 * 0.5 secs). Is that enough?

[seflerZ]

Hi @matt335672 , according to @JulyIghor 's feedback. We have a duplicate registration in input_ibus.c. Would you apply this patch to fix it up? I've tested it works.

From 29c8bfbd6d7227956c6baa944aac4b2e5649d7ba Mon Sep 17 00:00:00 2001
From: seflerZ <sefler@126.com>
Date: Thu, 30 May 2024 14:42:22 +0800
Subject: [PATCH] remove duplicate enable&disable func registration

---
 sesman/chansrv/input_ibus.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/sesman/chansrv/input_ibus.c b/sesman/chansrv/input_ibus.c
index 7b803e3a..b7ff2992 100644
--- a/sesman/chansrv/input_ibus.c
+++ b/sesman/chansrv/input_ibus.c
@@ -155,8 +155,6 @@ xrdp_input_main_loop(void *in_val)
     factory = ibus_factory_new(ibus_bus_get_connection(bus));
     g_object_ref_sink(factory);
     g_signal_connect(factory, "create-engine", G_CALLBACK(xrdp_input_ibus_create_engine), NULL);
-    g_signal_connect(factory, "enable", G_CALLBACK(xrdp_input_ibus_engine_enable), NULL);
-    g_signal_connect(factory, "disable", G_CALLBACK(xrdp_input_ibus_engine_disable), NULL);

     ibus_factory_add_engine(factory, "XrdpIme", IBUS_TYPE_ENGINE);

--
2.34.1