Made the preferred size of an Area its size on GTK+ as well.

prefsize_unix.go

@@ -14,8 +14,13 @@ import (
 // The difference? Minimum size takes into account things like truncation with ellipses: the minimum size of a label can allot just the ellipses!
 // So we use the natural size instead.
 // There is a warning about height-for-width controls, but in my tests this isn't an issue.
+// For Areas, we manually save the Area size and use that, just to be safe.
 
 func (s *sysData) preferredSize() (width int, height int) {
+	if s.ctype == c_area {
+		return s.areawidth, s.areaheight
+	}
+
 	_, _, width, height = gtk_widget_get_preferred_size(s.widget)
 	return width, height
 }

sysdata_unix.go

@@ -18,6 +18,9 @@ type sysData struct {
 	container		*C.GtkWidget	// for moving
 	pulse		chan bool		// for sysData.progressPulse()
 	clickCounter	clickCounter	// for Areas
+	// we probably don't need to save these, but we'll do so for sysData.preferredSize() just in case
+	areawidth		int
+	areaheight	int
 }
 
 type classData struct {
@@ -358,6 +361,8 @@ func (s *sysData) setAreaSize(width int, height int) {
 	uitask <- func() {
 		c := gtkAreaGetControl(s.widget)
 		gtk_widget_set_size_request(c, width, height)
+		s.areawidth = width		// for sysData.preferredSize()
+		s.areaheight = height
 		ret <- struct{}{}
 	}
 	<-ret

todo.md

@@ -28,7 +28,6 @@ UNIX:
 - resizing seems to be completely and totally broken in the Wayland backend
 	- TODO find out if this is a problem on the GTK+/Wayland side (no initial window-configure event?)
 - [12:55] <myklgo> pietro10: I meant to mention: 1073): Gtk-WARNING **: Theme parsing error: gtk.css:72:20: Not using units is deprecated. Assuming 'px'.    twice.
-- make sure the preferred size of Area is its size
 
 ALL PLATFORMS:
 - make sure MouseEvent's documentation has dragging described correctly (both Windows and GTK+ do)