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A-_ha_! The Windows Rectangle() call appears to get uppity if asked
to draw a 1x1 rectangle, presumably on the grounds that that's
beneath its dignity and you ought to be using SetPixel() instead. So
now I do, and now Net actually looks exactly the same on Windows and
GTK. Woo!

[originally from svn r4157]

--- a/windows.c

+++ b/windows.c

@@ -47,11 +47,21 @@

 void draw_rect(frontend *fe, int x, int y, int w, int h, int colour)

 {

-    HBRUSH oldbrush = SelectObject(fe->hdc_bm, fe->brushes[colour]);

-    HPEN oldpen = SelectObject(fe->hdc_bm, fe->pens[colour]);

-    Rectangle(fe->hdc_bm, x, y, x+w, y+h);

-    SelectObject(fe->hdc_bm, oldbrush);

-    SelectObject(fe->hdc_bm, oldpen);

+    if (w == 1 && h == 1) {

+	/*

+	 * Rectangle() appears to get uppity if asked to draw a 1x1

+	 * rectangle, presumably on the grounds that that's beneath

+	 * its dignity and you ought to be using SetPixel instead.

+	 * So I will.

+	 */

+	SetPixel(fe->hdc_bm, x, y, fe->colours[colour]);

+    } else {

+	HBRUSH oldbrush = SelectObject(fe->hdc_bm, fe->brushes[colour]);

+	HPEN oldpen = SelectObject(fe->hdc_bm, fe->pens[colour]);

+	Rectangle(fe->hdc_bm, x, y, x+w, y+h);

+	SelectObject(fe->hdc_bm, oldbrush);

+	SelectObject(fe->hdc_bm, oldpen);

+    }

 }

 void draw_line(frontend *fe, int x1, int y1, int x2, int y2, int colour)