patch 8.2.2370: Vim9: command fails in catch block

Problem:    Vim9: command fails in catch block.
Solution:   Reset force_abort and need_rethrow. (closes #7692)

src/testdir/test_vim9_script.vim

@@ -558,6 +558,43 @@ def Test_try_catch_throw()
   assert_equal(411, n)
 enddef
 
+def Test_cnext_works_in_catch()
+  var lines =<< trim END
+      vim9script
+      au BufEnter * eval 0
+      writefile(['text'], 'Xfile1')
+      writefile(['text'], 'Xfile2')
+      var items = [
+          {lnum: 1, filename: 'Xfile1', valid: true},
+          {lnum: 1, filename: 'Xfile2', valid: true}
+        ]
+      setqflist([], ' ', {items: items})
+      cwindow
+
+      def CnextOrCfirst()
+        # if cnext fails, cfirst is used
+        try
+          cnext
+        catch
+          cfirst
+        endtry
+      enddef
+
+      CnextOrCfirst()
+      CnextOrCfirst()
+      writefile([getqflist({idx: 0}).idx], 'Xresult')
+      qall
+  END
+  writefile(lines, 'XCatchCnext')
+  RunVim([], [], '--clean -S XCatchCnext')
+  assert_equal(['1'], readfile('Xresult'))
+
+  delete('Xfile1')
+  delete('Xfile2')
+  delete('XCatchCnext')
+  delete('Xresult')
+enddef
+
 def Test_throw_skipped()
   if 0
     throw dontgethere