bug#9977: [PATCH] Fix focus handling when using emacsclient --parent-id

[David Benjamin]

Using emacsclient --parent-id causes emacs to call XSetInputFocus which
interferes with XEmbed (normally the embedder forwards key events). On
my system, it also interferes with compiz.

* xterm.h: Add x_embed_request_focus.

* xterm.c (x_embed_request_focus): New function to request focus
via XEmbed.

* xfns.c (Fx_focus_frame): If the frame is embedded, request focus
via XEmbed instead of using XSetInputFocus and _NET_ACTIVE_WINDOW.
---

This is a fairly small change I think, but it is also more than 15 lines, so if
you need a copyright form, send one my way.

 src/ChangeLog |   10 ++++++++++
 src/xfns.c    |   13 ++++++++++---
 src/xterm.c   |   13 +++++++++++++
 src/xterm.h   |    1 +
 4 files changed, 34 insertions(+), 3 deletions(-)

diff --git a/src/ChangeLog b/src/ChangeLog
index 8f56286..ec14669 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,13 @@
+2011-11-06  David Benjamin  <davidben@mit.edu>
+
+       * xterm.h: Add x_embed_request_focus.
+
+       * xterm.c (x_embed_request_focus): New function to request focus
+       via XEmbed.
+
+       * xfns.c (Fx_focus_frame): If the frame is embedded, request focus
+       via XEmbed instead of using XSetInputFocus and _NET_ACTIVE_WINDOW.
+
 2011-11-06  Chong Yidong  <cyd@gnu.org>
 
        * window.c (Fwindow_live_p, Fwindow_frame, Fframe_root_window)
diff --git a/src/xfns.c b/src/xfns.c
index 49c4c77..200ba49 100644
--- a/src/xfns.c
+++ b/src/xfns.c
@@ -3519,9 +3519,16 @@ FRAME nil means use the selected frame.  */)
 
   BLOCK_INPUT;
   x_catch_errors (dpy);
-  XSetInputFocus (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
-                 RevertToParent, CurrentTime);
-  x_ewmh_activate_frame (f);
+  if (FRAME_X_EMBEDDED_P (f))
+    {
+      x_embed_request_focus (f);
+    }
+  else
+    {
+      XSetInputFocus (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
+                     RevertToParent, CurrentTime);
+      x_ewmh_activate_frame (f);
+    }
   x_uncatch_errors ();
   UNBLOCK_INPUT;
 
diff --git a/src/xterm.c b/src/xterm.c
index fb77faa..cf2c6ca 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -8978,6 +8978,19 @@ x_lower_frame (struct frame *f)
     }
 }
 
+/* Request focus with XEmbed */
+
+void
+x_embed_request_focus (FRAME_PTR f)
+{
+  /* See XEmbed Protocol Specification at
+     http://freedesktop.org/wiki/Specifications/xembed-spec  */
+
+  if (f->async_visible)
+    xembed_send_message (f, CurrentTime,
+                        XEMBED_REQUEST_FOCUS, 0, 0, 0);
+}
+
 /* Activate frame with Extended Window Manager Hints */
 
 void
diff --git a/src/xterm.h b/src/xterm.h
index e10a6bc..50ed5e1 100644
--- a/src/xterm.h
+++ b/src/xterm.h
@@ -964,6 +964,7 @@ extern void x_clear_errors (Display *);
 extern void x_set_window_size (struct frame *, int, int, int);
 extern void x_set_mouse_position (struct frame *, int, int);
 extern void x_set_mouse_pixel_position (struct frame *, int, int);
+extern void x_embed_request_focus (struct frame *);
 extern void x_ewmh_activate_frame (struct frame *);
 extern void x_make_frame_visible (struct frame *);
 extern void x_make_frame_invisible (struct frame *);
-- 
1.7.8.rc0.36.g1d443