[gtk+/grid-widget] Fix some cornercases of the height-for-width implementation

[Matthias Clasen <matthiasc src gnome org>]

commit 3e0cde18df029acc3c9f7164b31e413c024b42bb
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Oct 10 14:47:20 2010 -0400

    Fix some cornercases of the height-for-width implementation
    
    * get_preferred_height just returns the preferred height for
    the minimum width when called in height-for-width mode.
    
    * get_preferred_width_for_height just returns the preferred
    width when called in height-for-width mode.
    
    * get_preferred_height_for_width never returns a height for
    width that is smaller than the minimal width.

 gtk/gtkgrid.c |   36 +++++++++++++++++++++++++-----------
 1 files changed, 25 insertions(+), 11 deletions(-)
---
diff --git a/gtk/gtkgrid.c b/gtk/gtkgrid.c
index e5d03fb..3c5b473 100644
--- a/gtk/gtkgrid.c
+++ b/gtk/gtkgrid.c
@@ -1087,8 +1087,11 @@ gtk_grid_get_size_for_orientation (GtkGrid        *grid,
                                    gint           *minimum,
                                    gint           *natural)
 {
+  gint min_size;
+
   gtk_grid_request_lines (grid, 1 - orientation, FALSE);
-  gtk_grid_allocate_lines (grid, 1 - orientation, size);
+  gtk_grid_request_sum (grid, 1 - orientation, &min_size, NULL);
+  gtk_grid_allocate_lines (grid, 1 - orientation, MAX (size, min_size));
   gtk_grid_request_lines (grid, orientation, TRUE);
   gtk_grid_request_sum (grid, orientation, minimum, natural);
 }
@@ -1098,7 +1101,13 @@ gtk_grid_get_preferred_width (GtkWidget *widget,
                               gint      *minimum,
                               gint      *natural)
 {
-  gtk_grid_get_size (GTK_GRID (widget), GTK_ORIENTATION_HORIZONTAL, minimum, natural);
+  GtkGrid *grid = GTK_GRID (widget);
+
+  if (gtk_grid_get_request_mode (widget) == GTK_SIZE_REQUEST_WIDTH_FOR_HEIGHT)
+
+    gtk_grid_get_size_for_orientation (grid, GTK_ORIENTATION_HORIZONTAL, 0, minimum, natural);
+  else
+    gtk_grid_get_size (grid, GTK_ORIENTATION_HORIZONTAL, minimum, natural);
 }
 
 static void
@@ -1106,7 +1115,12 @@ gtk_grid_get_preferred_height (GtkWidget *widget,
                                gint      *minimum,
                                gint      *natural)
 {
-  gtk_grid_get_size (GTK_GRID (widget), GTK_ORIENTATION_VERTICAL, minimum, natural);
+  GtkGrid *grid = GTK_GRID (widget);
+
+  if (gtk_grid_get_request_mode (widget) == GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH)
+    gtk_grid_get_size_for_orientation (grid, GTK_ORIENTATION_VERTICAL, 0, minimum, natural);
+  else
+    gtk_grid_get_size (grid, GTK_ORIENTATION_VERTICAL, minimum, natural);
 }
 
 static void
@@ -1117,10 +1131,10 @@ gtk_grid_get_preferred_width_for_height (GtkWidget *widget,
 {
   GtkGrid *grid = GTK_GRID (widget);
 
-  if (gtk_grid_get_request_mode (widget) != GTK_SIZE_REQUEST_WIDTH_FOR_HEIGHT)
-    gtk_grid_get_size (grid, GTK_ORIENTATION_VERTICAL, &height, NULL);
-
-  gtk_grid_get_size_for_orientation (grid, GTK_ORIENTATION_HORIZONTAL, height, minimum, natural);
+  if (gtk_grid_get_request_mode (widget) == GTK_SIZE_REQUEST_WIDTH_FOR_HEIGHT)
+    gtk_grid_get_size_for_orientation (grid, GTK_ORIENTATION_HORIZONTAL, height, minimum, natural);
+  else
+    gtk_grid_get_size (grid, GTK_ORIENTATION_HORIZONTAL, minimum, natural);
 }
 
 static void
@@ -1131,10 +1145,10 @@ gtk_grid_get_preferred_height_for_width (GtkWidget *widget,
 {
   GtkGrid *grid = GTK_GRID (widget);
 
-  if (gtk_grid_get_request_mode (widget) != GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH)
-    gtk_grid_get_size (grid, GTK_ORIENTATION_HORIZONTAL, &width, NULL);
-
-  gtk_grid_get_size_for_orientation (grid, GTK_ORIENTATION_VERTICAL, width, minimum, natural);
+  if (gtk_grid_get_request_mode (widget) == GTK_SIZE_REQUEST_HEIGHT_FOR_WIDTH)
+    gtk_grid_get_size_for_orientation (grid, GTK_ORIENTATION_VERTICAL, width, minimum, natural);
+  else
+    gtk_grid_get_size (grid, GTK_ORIENTATION_VERTICAL, minimum, natural);
 }
 
 static void