Backport from trunk.

* xfns.c (create_frame_xic): Pass XNStatusAttributes to XCreateIC
only if xic_style calls for it.  This change allows Emacs to work
with ibus.  Also, don't leak resources if create_frame_xic fails,
and stop caching xic_style across different displays.
(supported_xim_styles): Make const.
(best_xim_style): Remove first parameter: it's always just
supported_xim_styles.  Change to look at supported_xim_styles
directly.

Fixes: debbugs:17928

1 files changed, 94 insertions, 49 deletions

diff --git a/src/xfns.c b/src/xfns.c
index 5dbc7053fd9..692504ef762 100644
--- a/src/xfns.c
+++ b/src/xfns.c
@@ -1641,12 +1641,12 @@ hack_wm_protocols (struct frame *f, Widget widget)
 #ifdef HAVE_X_I18N
 
 static XFontSet xic_create_xfontset (struct frame *);
-static XIMStyle best_xim_style (XIMStyles *, XIMStyles *);
+static XIMStyle best_xim_style (XIMStyles *);
 
 
 /* Supported XIM styles, ordered by preference.  */
 
-static XIMStyle supported_xim_styles[] =
+static const XIMStyle supported_xim_styles[] =
 {
   XIMPreeditPosition | XIMStatusArea,
   XIMPreeditPosition | XIMStatusNothing,
@@ -1941,14 +1941,16 @@ xic_free_xfontset (struct frame *f)
    input method XIM.  */
 
 static XIMStyle
-best_xim_style (XIMStyles *user, XIMStyles *xim)
+best_xim_style (XIMStyles *xim)
 {
   int i, j;
+  int nr_supported =
+    sizeof (supported_xim_styles) / sizeof (supported_xim_styles[0]);
 
-  for (i = 0; i < user->count_styles; ++i)
+  for (i = 0; i < nr_supported; ++i)
     for (j = 0; j < xim->count_styles; ++j)
-      if (user->supported_styles[i] == xim->supported_styles[j])
-	return user->supported_styles[i];
+      if (supported_xim_styles[i] == xim->supported_styles[j])
+	return supported_xim_styles[i];
 
   /* Return the default style.  */
   return XIMPreeditNothing | XIMStatusNothing;
@@ -1956,42 +1958,41 @@ best_xim_style (XIMStyles *user, XIMStyles *xim)
 
 /* Create XIC for frame F. */
 
-static XIMStyle xic_style;
-
 void
 create_frame_xic (struct frame *f)
 {
   XIM xim;
   XIC xic = NULL;
   XFontSet xfs = NULL;
+  XVaNestedList status_attr = NULL;
+  XVaNestedList preedit_attr = NULL;
+  XRectangle s_area;
+  XPoint spot;
+  XIMStyle xic_style;
 
   if (FRAME_XIC (f))
-    return;
+    goto out;
 
-  /* Create X fontset. */
-  xfs = xic_create_xfontset (f);
   xim = FRAME_X_XIM (f);
-  if (xim)
-    {
-      XRectangle s_area;
-      XPoint spot;
-      XVaNestedList preedit_attr;
-      XVaNestedList status_attr;
+  if (!xim)
+    goto out;
 
-      s_area.x = 0; s_area.y = 0; s_area.width = 1; s_area.height = 1;
-      spot.x = 0; spot.y = 1;
+  /* Determine XIC style.  */
+  xic_style = best_xim_style (FRAME_X_XIM_STYLES (f));
 
-      /* Determine XIC style.  */
-      if (xic_style == 0)
-	{
-	  XIMStyles supported_list;
-	  supported_list.count_styles = (sizeof supported_xim_styles
-					 / sizeof supported_xim_styles[0]);
-	  supported_list.supported_styles = supported_xim_styles;
-	  xic_style = best_xim_style (&supported_list,
-				      FRAME_X_XIM_STYLES (f));
-	}
+  /* Create X fontset. */
+  if (xic_style & (XIMPreeditPosition | XIMStatusArea))
+    {
+      xfs = xic_create_xfontset (f);
+      if (!xfs)
+        goto out;
 
+      FRAME_XIC_FONTSET (f) = xfs;
+    }
+
+  if (xic_style & XIMPreeditPosition)
+    {
+      spot.x = 0; spot.y = 1;
       preedit_attr = XVaCreateNestedList (0,
 					  XNFontSet, xfs,
 					  XNForeground,
@@ -2003,31 +2004,75 @@ create_frame_xic (struct frame *f)
 					   : NULL),
 					  &spot,
 					  NULL);
+
+      if (!preedit_attr)
+        goto out;
+    }
+
+  if (xic_style & XIMStatusArea)
+    {
+      s_area.x = 0; s_area.y = 0; s_area.width = 1; s_area.height = 1;
       status_attr = XVaCreateNestedList (0,
-					 XNArea,
-					 &s_area,
-					 XNFontSet,
-					 xfs,
-					 XNForeground,
-					 FRAME_FOREGROUND_PIXEL (f),
-					 XNBackground,
-					 FRAME_BACKGROUND_PIXEL (f),
-					 NULL);
-
-      xic = XCreateIC (xim,
-		       XNInputStyle, xic_style,
-		       XNClientWindow, FRAME_X_WINDOW (f),
-		       XNFocusWindow, FRAME_X_WINDOW (f),
-		       XNStatusAttributes, status_attr,
-		       XNPreeditAttributes, preedit_attr,
-		       NULL);
-      XFree (preedit_attr);
-      XFree (status_attr);
+                                         XNArea,
+                                         &s_area,
+                                         XNFontSet,
+                                         xfs,
+                                         XNForeground,
+                                         FRAME_FOREGROUND_PIXEL (f),
+                                         XNBackground,
+                                         FRAME_BACKGROUND_PIXEL (f),
+                                         NULL);
+
+      if (!status_attr)
+        goto out;
     }
 
+  if (preedit_attr && status_attr)
+    xic = XCreateIC (xim,
+                     XNInputStyle, xic_style,
+                     XNClientWindow, FRAME_X_WINDOW (f),
+                     XNFocusWindow, FRAME_X_WINDOW (f),
+                     XNStatusAttributes, status_attr,
+                     XNPreeditAttributes, preedit_attr,
+                     NULL);
+  else if (preedit_attr)
+    xic = XCreateIC (xim,
+                     XNInputStyle, xic_style,
+                     XNClientWindow, FRAME_X_WINDOW (f),
+                     XNFocusWindow, FRAME_X_WINDOW (f),
+                     XNPreeditAttributes, preedit_attr,
+                     NULL);
+  else if (status_attr)
+    xic = XCreateIC (xim,
+                     XNInputStyle, xic_style,
+                     XNClientWindow, FRAME_X_WINDOW (f),
+                     XNFocusWindow, FRAME_X_WINDOW (f),
+                     XNStatusAttributes, status_attr,
+                     NULL);
+  else
+    xic = XCreateIC (xim,
+                     XNInputStyle, xic_style,
+                     XNClientWindow, FRAME_X_WINDOW (f),
+                     XNFocusWindow, FRAME_X_WINDOW (f),
+                     NULL);
+
+  if (!xic)
+    goto out;
+
   FRAME_XIC (f) = xic;
   FRAME_XIC_STYLE (f) = xic_style;
-  FRAME_XIC_FONTSET (f) = xfs;
+  xfs = NULL; /* Don't free below.  */
+
+ out:
+
+  if (xfs)
+    free_frame_xic (f);
+
+  if (preedit_attr)
+    XFree (preedit_attr);
+
+  if (status_attr)
+    XFree (status_attr);
 }