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kbdfs: consult also escaped scancode table when decoding runes (thanks aap)

When at the task of decomposing a rune into its
"button" and "rune", also consider the keyboard
map table with the escaped scancodes.

This fixes Shift + left/right combinations in
drawterm.

--- a/sys/src/cmd/aux/kbdfs/kbdfs.c

+++ b/sys/src/cmd/aux/kbdfs/kbdfs.c

@@ -552,9 +552,14 @@

 			if(kbtabs[Lnone][i] == k.r || kbtabs[Lshift][i] == k.r || (i >= 16 && kbtabs[Lctl][i] == k.r)){

 				/* assign button from kbtab */

 				k.b = kbtabs[Lnone][i];

+

 				/* handle ^X forms */

 				if(k.r == kbtabs[Lnone][i] && kbtabs[Lctl][i] && !a->shift && !a->altgr && a->ctl)

 					k.r = kbtabs[Lctl][i];

+				break;

+			} else if(kbtabs[Lesc1][i] == k.r || kbtabs[Lshiftesc1][i] == k.r){

+				/* check escaped scancodes too */

+				k.b = kbtabs[Lesc1][i];

 				break;

 			}

 		}

-- 

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