Add a GUI_FORCE_WIDGET_MINIMUM_SIZE macro.

This way it's possible to force the (minimum) size of a widget.

data/gui/default/macros/_initial.cfg

@@ -150,6 +150,72 @@
 
 #enddef
 
+# Forces a wiget to be of a certain size.
+# Depending of the flags of the parent widget the item will grow
+#
+# WIDTH                           Minimum width for the widget.
+# HEIGHT                          Minimum height for the widget.
+# WIDGET                          The widget to add into the item.
+#
+# eg instead of
+#	[label]
+#       # Note Foo has trailing spaces to force extra width. 
+#		label = "
+#               Foo        
+#               "
+#	[label]
+# you can do:
+#
+# {GUI_FORCE_WIDGET_MINIMUM_SIZE 150 75 (
+#	[label]
+#		label = "Foo"
+#	[label]
+# )}
+#
+#define GUI_FORCE_WIDGET_MINIMUM_SIZE WIDTH HEIGHT WIDGET
+[stacked_widget]
+	definition = "default"
+
+	[stack]
+
+		[layer]
+
+			[row]
+
+				[column]
+
+					[spacer]
+						definition = "default"
+						width = "{WIDTH}"
+						height = "{HEIGHT}"
+					[/spacer]
+
+				[/column]
+
+			[/row]
+
+		[/layer]
+
+		[layer]
+
+			[row]
+				grow_factor = 1
+				[column]
+					grow_factor = 1
+					horizontal_grow = "true"
+					vertical_grow = "true"
+					{WIDGET}
+				[/column]
+
+			[/row]
+
+		[/layer]
+
+	[/stack]
+
+[/stacked_widget]
+#enddef
+
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 ### Macros for the tiny gui.                                                ###