fix(treesitter): show proper node name error messages

**Problem:** Currently node names with non-alphanumeric, non
underscore/hyphen characters (only possible with anonymous nodes) are
not given a proper error message. See tree-sitter issue 3892 for more
details.

**Solution:** Apply a different scanning logic to anonymous nodes to
correctly identify the entire node name (i.e., up until the final double
quote)

src/nvim/lua/treesitter.c

@@ -1528,10 +1528,25 @@ static void query_err_string(const char *src, int error_offset, TSQueryError err
       || error_type == TSQueryErrorField
       || error_type == TSQueryErrorCapture) {
     const char *suffix = src + error_offset;
+    bool is_anonymous = error_type == TSQueryErrorNodeType && suffix[-1] == '"';
     int suffix_len = 0;
     char c = suffix[suffix_len];
-    while (isalnum(c) || c == '_' || c == '-' || c == '.') {
+    if (is_anonymous) {
-      c = suffix[++suffix_len];
+      int backslashes = 0;
+      // Stop when we hit an unescaped double quote
+      while (c != '"' || backslashes % 2 != 0) {
+        if (c == '\\') {
+          backslashes += 1;
+        } else {
+          backslashes = 0;
+        }
+        c = suffix[++suffix_len];
+      }
+    } else {
+      // Stop when we hit the end of the identifier
+      while (isalnum(c) || c == '_' || c == '-' || c == '.') {
+        c = suffix[++suffix_len];
+      }
     }
     snprintf(err, errlen, "\"%.*s\":\n", suffix_len, suffix);
     offset = strlen(err);

test/functional/treesitter/query_spec.lua

@@ -722,7 +722,25 @@ void ui_refresh(void)
       eq(exp, pcall_err(exec_lua, "vim.treesitter.query.parse('c', ...)", cquery))
     end
 
-    -- Invalid node type
+    -- Invalid node types
+    test(
+      '.../query.lua:0: Query error at 1:2. Invalid node type ">\\">>":\n'
+        .. '">\\">>" @operator\n'
+        .. ' ^',
+      '">\\">>" @operator'
+    )
+    test(
+      '.../query.lua:0: Query error at 1:2. Invalid node type "\\\\":\n'
+        .. '"\\\\" @operator\n'
+        .. ' ^',
+      '"\\\\" @operator'
+    )
+    test(
+      '.../query.lua:0: Query error at 1:2. Invalid node type ">>>":\n'
+        .. '">>>" @operator\n'
+        .. ' ^',
+      '">>>" @operator'
+    )
     test(
       '.../query.lua:0: Query error at 1:2. Invalid node type "dentifier":\n'
         .. '(dentifier) @variable\n'