fix accidentally mistaking missing files for not missing, given new implementation of os_properties_from_file_path

src/os/core/win32/os_core_win32.c

@@ -803,14 +803,15 @@ os_properties_from_file_path(String8 path)
   Temp scratch = scratch_begin(0, 0);
   String16 path16 = str16_from_8(scratch.arena, path);
   HANDLE handle = FindFirstFileW((WCHAR *)path16.str, &find_data);
-  FindClose(handle);
   FileProperties props = {0};
+  if(handle != INVALID_HANDLE_VALUE)
   {
     props.size = Compose64Bit(find_data.nFileSizeHigh, find_data.nFileSizeLow);
     w32_dense_time_from_file_time(&props.created, &find_data.ftCreationTime);
     w32_dense_time_from_file_time(&props.modified, &find_data.ftLastWriteTime);
     props.flags = w32_file_property_flags_from_dwFileAttributes(find_data.dwFileAttributes);
   }
+  FindClose(handle);
   scratch_end(scratch);
   return props;
 }

src/txti/txti.c

@@ -984,12 +984,15 @@ txti_mut_thread_entry_point(void *p)
       {
         FileProperties pre_load_props = os_properties_from_file_path(msg->string);
         OS_Handle file = os_file_open(OS_AccessFlag_Read|OS_AccessFlag_ShareRead|OS_AccessFlag_ShareWrite, msg->string);
-        timestamp = pre_load_props.modified;
         file_contents = os_string_from_file_range(scratch.arena, file, r1u64(0, pre_load_props.size));
         lang_kind = txti_lang_kind_from_extension(str8_skip_last_dot(msg->string));
         os_file_close(file);
         FileProperties post_load_props = os_properties_from_file_path(msg->string);
         load_valid = (post_load_props.modified == pre_load_props.modified);
+        if(load_valid)
+        {
+          timestamp = pre_load_props.modified;
+        }
       }
       
       //- rjf: nonzero lang kind -> unpack lang info