[gimp] plug-ins: make the applied pattern in qbist a bit more prominent.

[Jehan <jehanp src gnome org>]

commit 708f075f804caa5cbd11cae2f85f3726456aedcb
Author: Jehan <jehan girinstud io>
Date:   Wed Mar 24 01:03:44 2021 +0100

    plug-ins: make the applied pattern in qbist a bit more prominent.
    
    The qbist plug-in shows a grid of 9 patterns, it was not clear at all
    which one will be applied. Also it looked like selecting a pattern would
    make it disappear and loading a same file twice would not create the
    same patterns (as said in commit 7fb696206e).
    
    Actually the plug-in works fine, but it is simply not clear at all what
    is happening until we look at the code. The center pattern is the main
    one: the one which will be applied and the only one which will be stored
    or loaded in/from a file if we decide to save the pattern. Also when
    selecting a pattern, it does not disappear, it is moved to the center
    (but you don't necessarily realize it, especially as several will look
    the same). And the reason why you get different result when loading a
    saved pattern is that it only reimports the center pattern; all others
    are indeed randomized from this stable source.
    
    So my fix is attempting to have this center pattern standing out a bit
    more by framing it with a "Pattern" title. It's not perfect, and I'm not
    very happy with this design, but I don't find a nice widget for better
    framing the center pattern, nor do I want to spend too much time on
    this. It's better than before at least.

 plug-ins/common/qbist.c | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)
---
diff --git a/plug-ins/common/qbist.c b/plug-ins/common/qbist.c
index cc052747d1..8b8551ded4 100644
--- a/plug-ins/common/qbist.c
+++ b/plug-ins/common/qbist.c
@@ -888,8 +888,27 @@ dialog_run (void)
   for (i = 0; i < 9; i++)
     {
       button = gtk_button_new ();
-      gtk_grid_attach (GTK_GRID (grid), button, i % 3, i / 3, 1, 1);
-                        // GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
+      if (i == 4)
+        {
+          GtkWidget *frame;
+
+          frame = gtk_frame_new (_("Pattern"));
+          gtk_frame_set_label_align (GTK_FRAME (frame), 0.5, 0.5);
+          gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_ETCHED_OUT);
+          gtk_grid_attach (GTK_GRID (grid), frame, i % 3, i / 3, 1, 2);
+
+          gtk_container_add (GTK_CONTAINER (frame), button);
+          gtk_widget_show (frame);
+        }
+      else if (i > 2)
+        {
+          gtk_grid_attach (GTK_GRID (grid), button, i % 3, i / 3 + 1, 1, 1);
+        }
+      else
+        {
+          gtk_grid_attach (GTK_GRID (grid), button, i % 3, i / 3, 1, 1);
+        }
+      gtk_widget_set_valign (button, GTK_ALIGN_END);
       gtk_widget_show (button);
 
       g_signal_connect (button, "clicked",