Fix json_tree() when it is given a root that ends with an array index so

that it returns the correct "key" for the first root.  This was broken
by check-in [858b76a00e8ff552] and in version 3.45.0.  Problem reported
by [forum:/info/2026-10-14T08:42:26Z|Forum post 2026-10-14T08:42:26Z].

FossilOrigin-Name: eaf646e376a5a3e10a874ed1c07ca1382f0ccb7cdf1cc963697638a54b98c779

manifest

@@ -1,5 +1,5 @@
-C Have\stestrunner.tcl\sunset\senvironment\svariable\sDEBUGINFOD_URLS.\sLeaving\sit\sset\sslows\sdown\ssome\ssanitizer\srelease\stests.
-D 2026-10-14T17:52:21.757
+C Fix\sjson_tree()\swhen\sit\sis\sgiven\sa\sroot\sthat\sends\swith\san\sarray\sindex\sso\nthat\sit\sreturns\sthe\scorrect\s"key"\sfor\sthe\sfirst\sroot.\s\sThis\swas\sbroken\nby\scheck-in\s[858b76a00e8ff552]\sand\sin\sversion\s3.45.0.\s\sProblem\sreported\nby\s[forum:/info/2026-10-14T08:42:26Z|Forum\spost\s2026-10-14T08:42:26Z].
+D 2026-10-14T17:52:44.574
 F .fossil-settings/binary-glob 61195414528fb3ea9693577e1980230d78a1f8b0a54c78cf1b9b24d0a409ed6a x
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
@@ -765,7 +765,7 @@ F src/hash.h 46b92795a95bfefb210f52f0c316e9d7cdbcdd7e7fcfb0d8be796d3a5767cddf
 F src/hwtime.h 5cb15147c8583d0fc4748e1c12ea6f38c9deaeefa147a4d8d379fd9bc81fee9a
 F src/in-operator.md 10cd8f4bcd225a32518407c2fb2484089112fd71
 F src/insert.c 482d853c980f4765f045bbea3ab095067a52cd57f47e357f9f17aa7c7fff793f
-F src/json.c c3ba268dda607a377f210dcf84603bb3d282f9833c8aa0abfb0c8951aefc40be
+F src/json.c 7d28da4a3740941eab5fa3361276160bb7698bf87218c9d30be7c10b894b6115
 F src/legacy.c d7874bc885906868cd51e6c2156698f2754f02d9eee1bae2d687323c3ca8e5aa
 F src/loadext.c 5cd4cd7ec6e1a46416806899086363fbf95eecd3bfb9a388b436c9a77243c902
 F src/main.c a32bcae6e3bfd9209d922b02c28ba796fa628322c3c4be0c5a76c418be793d13
@@ -1445,7 +1445,7 @@ F test/json106.test 4aed3afd16549045d198a8d9cea00deea96e1f2ecf55864dce96cac558b8
 F test/json107.test 59054e815c8f6b67d634d44ace421cf975828fb5651c4460aa66015c8e19d562
 F test/json108.test eab1859b19138ee03acd4415751308fc3849943c669a06b515bba658b96b55c3
 F test/json109.test 441cea5d73c24a1a34d284101740dfae5a082237c048c8a66b03aeebe5e3643e
-F test/json501.test b95e2d14988b682a5cadf079dd6162f0f85fb74cd59c6b1f1624110104a974eb
+F test/json501.test 25e3ffd0e1e70efb3328e823dbad304687f1340e5b337bebef6e9a3e641d12de
 F test/json502.test 4ef68e4f272dfb083d4cbceb4e9e51d67ec1186a185e0c13637c50a4dc2f9796
 F test/jsonb01.test 42419c8080af5660cdfd3fddec322d28bdbc244d9800ee9569091d455f1c0dea
 F test/keyword1.test 37ef6bba5d2ed5b07ecdd6810571de2956599dff
@@ -2289,8 +2289,8 @@ F tool/warnings-clang.sh bbf6a1e685e534c92ec2bfba5b1745f34fb6f0bc2a362850723a9ee
 F tool/warnings.sh a554d13f6e5cf3760f041b87939e3d616ec6961859c3245e8ef701d1eafc2ca2
 F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
 F tool/winmain.c 00c8fb88e365c9017db14c73d3c78af62194d9644feaf60e220ab0f411f3604c
-P dabff5c1cde60883f23d41f713f44a5942ae229c3abe280778dc2df41c894907
-R 4b5be89660c013e09134f29cfb5bd25f
-U dan
-Z 5c757519b05c9f98504f3f397cdcd79c
+P b7ebfea1c1fd4a4d70f1e429c4ad5d21502e10ab28f90bdb7ae1da2df417cf8b
+R 3f1448a6708915bf4329e06e60d98963
+U drh
+Z f9f5896078163a8ca87e19dbd687eb77
 # Remove this line to create a well-formed Fossil manifest.

manifest.uuid

@@ -1 +1 @@
-b7ebfea1c1fd4a4d70f1e429c4ad5d21502e10ab28f90bdb7ae1da2df417cf8b
+eaf646e376a5a3e10a874ed1c07ca1382f0ccb7cdf1cc963697638a54b98c779

src/json.c

@@ -5512,17 +5512,16 @@ static int jsonEachPathLength(JsonEachCursor *p){
   u32 n = p->path.nUsed;
   char *z = p->path.zBuf;
   if( p->iRowid==0 && p->bRecursive && n>=2 ){
-    while( n>1 ){
+    while( ALWAYS(n>1) ){
       n--;
       if( z[n]=='[' || z[n]=='.' ){
-        u32 x, sz = 0;
+        u32 x;
         char cSaved = z[n];
         z[n] = 0;
         assert( p->sParse.eEdit==0 );
         x = jsonLookupStep(&p->sParse, 0, z+1, 0);
         z[n] = cSaved;
-        if( JSON_LOOKUP_ISERROR(x) ) continue;
-        if( x + jsonbPayloadSize(&p->sParse, x, &sz) == p->i ) break;
+        if( !JSON_LOOKUP_ISERROR(x) ) break;
       }
     }
   }

test/json501.test

@@ -332,5 +332,16 @@ for {set c 1} {$c<=0x1f} {incr c} {
   } "{{\"label\":\"abc${e}xyz\"}}"
 }
 
+# Forum post 2026-10-14T08:42:26Z
+#
+do_execsql_test 15.0 {
+  WITH json(jid,jx) AS (VALUES
+    (1,'{"a":"text","b":123,"c":[1,2,3,"t",{"cc":99,"dd":100}],"d":null}'),
+    (2,'[1,"a",{"aa":11,"bb":[9,8,7]},null]')
+  ), paths(pid,px) AS (VALUES(1,'$.c[4]'),(2,'$.c'),(3,'$[2].bb'),(4,'$[2]'))
+  SELECT jj.key, typeof(jj.key) FROM json, paths, json_tree(jx,px) AS jj
+   WHERE parent IS NULL
+   ORDER BY jid, pid;
+} {4 integer c text bb text 2 integer}
 
 finish_test