[9front] [PATCH] acme: don't let tag button draw over tag border.

[james palmer <james@biobuf.link>]

this fixes the apperance of a 2px wide gap between the edge of the tag
button and the start of the bottom border by making the tag button 2px
less wide rather than shrinking it's rectange after creating the image.

from this plan9port pull request:
https://github.com/9fans/plan9port/pull/490

- james

From: james palmer <james@biobuf.link>
Date: Wed, 06 Oct 2021 09:19:58 +0000
Subject: [PATCH] acme: don't let tag button draw over tag border.

---
diff 6ebb8b9e357944cc29ae3fafc0900ee3e325ed39
2134a2c638e2668f45a92ec814326689cc8089c3
--- a/sys/src/cmd/acme/acme.c	Sun Oct  3 16:58:58 2021
+++ b/sys/src/cmd/acme/acme.c	Wed Oct  6 10:19:58 2021
@@ -895,16 +895,14 @@
 		freeimage(colbutton);
 	}
 
-	r = Rect(0, 0, Scrollwid+2, font->height+1);
+	r = Rect(0, 0, Scrollwid, font->height+1);
 	button = allocimage(display, r, screen->chan, 0, DNofill);
 	draw(button, r, tagcols[BACK], nil, r.min);
-	r.max.x -= 2;
 	border(button, r, 2, tagcols[BORD], ZP);
 
 	r = button->r;
 	modbutton = allocimage(display, r, screen->chan, 0, DNofill);
 	draw(modbutton, r, tagcols[BACK], nil, r.min);
-	r.max.x -= 2;
 	border(modbutton, r, 2, tagcols[BORD], ZP);
 	r = insetrect(r, 2);
 	tmp = allocimage(display, Rect(0,0,1,1), screen->chan, 1,
DMedblue);