patch 8.2.3305: Vim9: :finally in skipped block not handled correctly

Problem:    Vim9: :finally in skipped block not handled correctly.
Solution:   Check whether :finally is in a skipped block. (Naruhiko Nishino,
            closes #8724)

src/ex_eval.c

@@ -2018,7 +2018,8 @@ ex_endtry(exarg_T *eap)
 	{
 	    idx = cstack->cs_idx;
 
-	    if (in_vim9script()
+	    // Check the flags only when not in a skipped block.
+	    if (!skip && in_vim9script()
 		     && (cstack->cs_flags[idx] & (CSF_CATCH|CSF_FINALLY)) == 0)
 	    {
 		// try/endtry without any catch or finally: give an error and

src/testdir/test_vim9_script.vim

@@ -641,6 +641,20 @@ def Test_try_catch_throw()
       endtry
   END
   CheckScriptFailure(lines, 'E1032:')
+
+  # skipping try-finally-endtry when try-finally-endtry is used in another block
+  lines =<< trim END
+      if v:true
+        try
+        finally
+        endtry
+      else
+        try
+        finally
+        endtry
+      endif
+  END
+  CheckDefAndScriptSuccess(lines)
 enddef
 
 def Test_try_in_catch()

src/version.c

@@ -755,6 +755,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3305,
 /**/
     3304,
 /**/

src/vim9compile.c

@@ -8569,6 +8569,8 @@ compile_finally(char_u *arg, cctx_T *cctx)
 	return NULL;
     }
 
+    if (cctx->ctx_skip != SKIP_YES)
+    {
 	// End :catch or :finally scope: set value in ISN_TRY instruction
 	isn = ((isn_T *)instr->ga_data) + scope->se_u.se_try.ts_try_label;
 	if (isn->isn_arg.try.try_ref->try_finally != 0)
@@ -8612,6 +8614,7 @@ compile_finally(char_u *arg, cctx_T *cctx)
 	    return NULL;
 
 	// TODO: set index in ts_finally_label jumps
+    }
 
     return arg;
 }