[gnome-builder/wip/gtk4-port: 303/736] libide/gui: work around weirdness with GtkPicture

[Christian Hergert <chergert src gnome org>]

commit 55869b4ce943e6aa8efbac73c04f81f7b403b8a9
Author: Christian Hergert <chergert redhat com>
Date:   Thu Mar 31 21:45:42 2022 -0700

    libide/gui: work around weirdness with GtkPicture

 src/libide/gui/ide-style-variant-preview.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
---
diff --git a/src/libide/gui/ide-style-variant-preview.c b/src/libide/gui/ide-style-variant-preview.c
index ce9b80f6b..3efca63cb 100644
--- a/src/libide/gui/ide-style-variant-preview.c
+++ b/src/libide/gui/ide-style-variant-preview.c
@@ -117,6 +117,25 @@ ide_style_variant_preview_snapshot (GtkWidget   *widget,
   GTK_WIDGET_CLASS (ide_style_variant_preview_parent_class)->snapshot (widget, snapshot);
 }
 
+static void
+ide_style_variant_preview_measure (GtkWidget      *widget,
+                                   GtkOrientation  orientation,
+                                   int             for_size,
+                                   int            *minimum,
+                                   int            *natural,
+                                   int            *minimum_baseline,
+                                   int            *natural_baseline)
+{
+  GTK_WIDGET_CLASS (ide_style_variant_preview_parent_class)->measure (widget, orientation, for_size, 
minimum, natural, minimum_baseline, natural_baseline);
+
+  /* Work around GtkPicture wierdness */
+  if (orientation == GTK_ORIENTATION_VERTICAL)
+    {
+      *natural = *minimum;
+      *natural_baseline = *minimum_baseline;
+    }
+}
+
 static void
 ide_style_variant_preview_dispose (GObject *object)
 {
@@ -178,6 +197,7 @@ ide_style_variant_preview_class_init (IdeStyleVariantPreviewClass *klass)
   object_class->set_property = ide_style_variant_preview_set_property;
 
   widget_class->snapshot = ide_style_variant_preview_snapshot;
+  widget_class->measure = ide_style_variant_preview_measure;
 
   properties [PROP_COLOR_SCHEME] =
     g_param_spec_enum ("color-scheme",