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walk: handle removed files correctly

A file that was not checked in, added, and
then removed would be shown as modified, and
not skipped. It would also be stuck in the
index forever.

This change skips showing untracked moved files
and purges them from the index.

--- a/sys/src/cmd/git/walk.c

+++ b/sys/src/cmd/git/walk.c

@@ -496,9 +496,14 @@

 			c = strcmp(idx[i].path, wdir[j].path);

 		/* exists in both index and on disk */

 		if(c == 0){

-			if(idx[i].state == 'R' && checkedin(&idx[i], 0))

-				show(o, Rflg, rstr, idx[i].path);

-			else if(idx[i].state == 'A' && !checkedin(&idx[i], 1))

+			if(idx[i].state == 'R'){

+				if(checkedin(&idx[i], 0))

+					show(o, Rflg, rstr, idx[i].path);

+				else{

+					idx[i].state = 'U';

+					staleidx = 1;

+				}

+			}else if(idx[i].state == 'A' && !checkedin(&idx[i], 1))

 				show(o, Aflg, astr, idx[i].path);

 			else if(!samedata(&idx[i], &wdir[j]))

 				show(o, Mflg, mstr, idx[i].path);

@@ -534,6 +539,8 @@

 		for(i = 0; i < nidx; i++){

 			while(i+1 < nidx && strcmp(idx[i].path, idx[i+1].path) == 0)

 				i++;

+			if(idx[i].state == 'U')

+				continue;

 			Bprint(w, "%c %Q %o %s\n",

 				idx[i].state,

 				idx[i].qid,