Minor fixes to PGTK child frames

* src/gtkutil.c (xg_check_special_colors): Handle child frames
correctly.
* src/pgtkfns.c (pgtk_set_child_frame_border_width): Synchronize
code from X.  (bug#55588)
* src/pgtkmenu.c (pgtk_menu_show, pgtk_dialog_show): Allow in
child frames.  There are no problems here.
* src/pgtkterm.c (pgtk_mouse_position): Clean up coding style.

4 files changed, 73 insertions, 75 deletions

diff --git a/src/gtkutil.c b/src/gtkutil.c
index 11ccbbd6683..f2018bc01f5 100644
--- a/src/gtkutil.c
+++ b/src/gtkutil.c
@@ -736,67 +736,74 @@ xg_check_special_colors (struct frame *f,
                          const char *color_name,
                          Emacs_Color *color)
 {
-  bool success_p = 0;
-  bool get_bg = strcmp ("gtk_selection_bg_color", color_name) == 0;
-  bool get_fg = !get_bg && strcmp ("gtk_selection_fg_color", color_name) == 0;
+  bool success_p;
+  bool get_bg;
+  bool get_fg;
+#ifdef HAVE_GTK3
+  GtkStyleContext *gsty;
+  GdkRGBA col;
+  char buf[sizeof "rgb://rrrr/gggg/bbbb"];
+  int state;
+  GdkRGBA *c;
+  unsigned short r, g, b;
+#else
+  GtkStyle *gsty;
+  GdkColor *grgb;
+#endif
+
+  get_bg = !strcmp ("gtk_selection_bg_color", color_name);
+  get_fg = !get_bg && !strcmp ("gtk_selection_fg_color", color_name);
+  success_p = false;
 
-  if (! FRAME_GTK_WIDGET (f) || ! (get_bg || get_fg))
+#ifdef HAVE_PGTK
+  while (FRAME_PARENT_FRAME (f))
+    f = FRAME_PARENT_FRAME (f);
+#endif
+
+  if (!FRAME_GTK_WIDGET (f) || !(get_bg || get_fg))
     return success_p;
 
   block_input ();
-  {
 #ifdef HAVE_GTK3
-#ifndef HAVE_PGTK
-    GtkStyleContext *gsty
-      = gtk_widget_get_style_context (FRAME_GTK_OUTER_WIDGET (f));
-#else
-    GtkStyleContext *gsty
-      = gtk_widget_get_style_context (FRAME_WIDGET (f));
-#endif
-    GdkRGBA col;
-    char buf[sizeof "rgb://rrrr/gggg/bbbb"];
-    int state = GTK_STATE_FLAG_SELECTED|GTK_STATE_FLAG_FOCUSED;
-    if (get_fg)
-      gtk_style_context_get_color (gsty, state, &col);
-    else
-      {
-        GdkRGBA *c;
-        /* FIXME: Retrieving the background color is deprecated in
-           GTK+ 3.16.  New versions of GTK+ don't use the concept of a
-           single background color any more, so we shouldn't query for
-           it.  */
-        gtk_style_context_get (gsty, state,
-                               GTK_STYLE_PROPERTY_BACKGROUND_COLOR, &c,
-                               NULL);
-        col = *c;
-        gdk_rgba_free (c);
-      }
+  gsty = gtk_widget_get_style_context (FRAME_GTK_OUTER_WIDGET (f));
+  state = GTK_STATE_FLAG_SELECTED | GTK_STATE_FLAG_FOCUSED;
+
+  if (get_fg)
+    gtk_style_context_get_color (gsty, state, &col);
+  else
+    {
+      /* FIXME: Retrieving the background color is deprecated in
+         GTK+ 3.16.  New versions of GTK+ don't use the concept of a
+         single background color any more, so we shouldn't query for
+         it.  */
+      gtk_style_context_get (gsty, state,
+                             GTK_STYLE_PROPERTY_BACKGROUND_COLOR, &c,
+                             NULL);
+      col = *c;
+      gdk_rgba_free (c);
+    }
 
-    unsigned short
-      r = col.red * 65535,
-      g = col.green * 65535,
-      b = col.blue * 65535;
+  r = col.red * 65535;
+  g = col.green * 65535;
+  b = col.blue * 65535;
 #ifndef HAVE_PGTK
-    sprintf (buf, "rgb:%04x/%04x/%04x", r, g, b);
-    success_p = x_parse_color (f, buf, color) != 0;
+  sprintf (buf, "rgb:%04x/%04x/%04x", r, g, b);
+  success_p = x_parse_color (f, buf, color) != 0;
 #else
-    sprintf (buf, "#%04x%04x%04x", r, g, b);
-    success_p = pgtk_parse_color (f, buf, color) != 0;
+  sprintf (buf, "#%04x%04x%04x", r, g, b);
+  success_p = pgtk_parse_color (f, buf, color) != 0;
 #endif
 #else
-    GtkStyle *gsty = gtk_widget_get_style (FRAME_GTK_WIDGET (f));
-    GdkColor *grgb = get_bg
-      ? &gsty->bg[GTK_STATE_SELECTED]
-      : &gsty->fg[GTK_STATE_SELECTED];
+  gsty = gtk_widget_get_style (FRAME_GTK_WIDGET (f));
+  grgb = (get_bg ? &gsty->bg[GTK_STATE_SELECTED]
+          : &gsty->fg[GTK_STATE_SELECTED]);
 
-    color->red = grgb->red;
-    color->green = grgb->green;
-    color->blue = grgb->blue;
-    color->pixel = grgb->pixel;
-    success_p = 1;
+  color->red = grgb->red;
+  color->green = grgb->green;
+  color->blue = grgb->blue;
+  color->pixel = grgb->pixel;
+  success_p = 1;
 #endif
-
-  }
   unblock_input ();
   return success_p;
 }
diff --git a/src/pgtkfns.c b/src/pgtkfns.c
index 1feb3fe250d..b26709d90c0 100644
--- a/src/pgtkfns.c
+++ b/src/pgtkfns.c
@@ -566,15 +566,23 @@ pgtk_set_tool_bar_lines (struct frame *f, Lisp_Object value, Lisp_Object oldval)
 static void
 pgtk_set_child_frame_border_width (struct frame *f, Lisp_Object arg, Lisp_Object oldval)
 {
-  int border = check_int_nonnegative (arg);
+  int border;
+
+  if (NILP (arg))
+    border = -1;
+  else if (RANGED_FIXNUMP (0, arg, INT_MAX))
+    border = XFIXNAT (arg);
+  else
+    signal_error ("Invalid child frame border width", arg);
 
   if (border != FRAME_CHILD_FRAME_BORDER_WIDTH (f))
     {
       f->child_frame_border_width = border;
 
-      if (FRAME_X_WINDOW (f))
+      if (FRAME_GTK_WIDGET (f))
         {
-          adjust_frame_size (f, -1, -1, 3, false, Qchild_frame_border_width);
+          adjust_frame_size (f, -1, -1, 3,
+                             false, Qchild_frame_border_width);
           pgtk_clear_under_internal_border (f);
         }
     }
diff --git a/src/pgtkmenu.c b/src/pgtkmenu.c
index eec9f419d07..2eabf6ac1bc 100644
--- a/src/pgtkmenu.c
+++ b/src/pgtkmenu.c
@@ -610,11 +610,6 @@ pgtk_menu_show (struct frame *f, int x, int y, int menuflags,
 
   *error_name = NULL;
 
-  if (!FRAME_GTK_OUTER_WIDGET (f)) {
-    *error_name = "Can't popup from child frames.";
-    return Qnil;
-  }
-
   if (menu_items_used <= MENU_ITEMS_PANE_LENGTH)
     {
       *error_name = "Empty menu";
@@ -919,11 +914,6 @@ pgtk_dialog_show (struct frame *f, Lisp_Object title,
 
   *error_name = NULL;
 
-  if (!FRAME_GTK_OUTER_WIDGET (f)) {
-    *error_name = "Can't popup from child frames.";
-    return Qnil;
-  }
-
   if (menu_items_n_panes > 1)
     {
       *error_name = "Multiple panes in dialog box";
diff --git a/src/pgtkterm.c b/src/pgtkterm.c
index 71b5f23283c..da958a6664a 100644
--- a/src/pgtkterm.c
+++ b/src/pgtkterm.c
@@ -3351,15 +3351,10 @@ pgtk_mouse_position (struct frame **fp, int insist, Lisp_Object * bar_window,
   if (gui_mouse_grabbed (dpyinfo)
       && (!EQ (track_mouse, Qdropping)
           && !EQ (track_mouse, Qdrag_source)))
-    {
-      /* 1.1. use last_mouse_frame as frame where the pointer is
-         on.  */
-      f1 = dpyinfo->last_mouse_frame;
-    }
+    f1 = dpyinfo->last_mouse_frame;
   else
     {
       f1 = *fp;
-      /* 1.2. get frame where the pointer is on.  */
       win = gtk_widget_get_window (FRAME_GTK_WIDGET (*fp));
       seat = gdk_display_get_default_seat (dpyinfo->gdpy);
       device = gdk_seat_get_pointer (seat);
@@ -3385,19 +3380,17 @@ pgtk_mouse_position (struct frame **fp, int insist, Lisp_Object * bar_window,
       return;
     }
 
-  /* 2. get the display and the device. */
   win = gtk_widget_get_window (FRAME_GTK_WIDGET (f1));
-  GdkDisplay *gdpy = gdk_window_get_display (win);
-  seat = gdk_display_get_default_seat (gdpy);
+  seat = gdk_display_get_default_seat (dpyinfo->gdpy);
   device = gdk_seat_get_pointer (seat);
 
-  /* 3. get x, y relative to edit window of the frame. */
-  win = gdk_window_get_device_position (win, device, &win_x, &win_y, &mask);
+  win = gdk_window_get_device_position (win, device,
+                                        &win_x, &win_y, &mask);
 
   if (f1 != NULL)
     {
-      dpyinfo = FRAME_DISPLAY_INFO (f1);
-      remember_mouse_glyph (f1, win_x, win_y, &dpyinfo->last_mouse_glyph);
+      remember_mouse_glyph (f1, win_x, win_y,
+                            &dpyinfo->last_mouse_glyph);
       dpyinfo->last_mouse_glyph_frame = f1;
 
       *bar_window = Qnil;