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devvga: re-render text from kmesg after resize

--- a/sys/src/9/pc/vga.c

+++ b/sys/src/9/pc/vga.c

@@ -217,6 +217,8 @@

 	qunlock(&drawlock);

+	vgascreenputs(kmesg.buf, kmesg.n);

+

 	screenputs = vgascreenputs;

 }

--- a/sys/src/9/port/devcons.c

+++ b/sys/src/9/port/devcons.c

@@ -63,16 +63,6 @@

 			break;

 }

-/*

- * Log console output so it can be retrieved via /dev/kmesg.

- * This is good for catching boot-time messages after the fact.

- */

-struct {

-	Lock lk;

-	char buf[16384];

-	uint n;

-} kmesg;

-

 static void

 kmesgputs(char *str, int n)

 {

--- a/sys/src/9/port/portdat.h

+++ b/sys/src/9/port/portdat.h

@@ -991,3 +991,13 @@

 #pragma	varargck	type	"V"	uchar*

 #pragma	varargck	type	"E"	uchar*

 #pragma	varargck	type	"M"	uchar*

+

+/*

+ * Log console output so it can be retrieved via /dev/kmesg.

+ * This is good for catching boot-time messages after the fact.

+ */

+struct {

+	Lock lk;

+	uint n;

+	char buf[16384];

+} kmesg;