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acme/Mail: only require confirmation if the window is dirty (thanks flowerss)

--- a/sys/src/cmd/upas/Mail/comp.c

+++ b/sys/src/cmd/upas/Mail/comp.c

@@ -97,8 +97,14 @@

 static void

 compquit(Comp *c, char **, int)

 {

-	if(c->quitting == 0)

+    /* Read acme dirty flag from compose window ctl file */

+	char d;

+	pread(c->ctl, &d, 1, 58);

+

+	if(d == '1' && c->quitting == 0)

 		fprint(2, "composing message\n");

+	if(d != '1')

+		c->quitting++;

 	c->quitting++;

 }

-- 

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