added condition to AutoFlushWrappper

[nazim9214]

fixes #1712

Added condition property to AutoFlushTargetWrapper, to allow autoflush on special conditions.

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This change is 

[304NotModified]

Thanks! 👍 👍

[304NotModified]

@nazim9214 Do you have time to add this to the wiki? If so, then we could include it for NLog 4.4. Please also add an example :)

Please add "introduced in NLog 4.4" .

I have still some documentation for NLog 4.4 to do, so working on that first

[codecov-io]

Current coverage is 81% (diff: 100%)

Merging #1817 into master will increase coverage by <1%

@@             master      #1817   diff @@
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  Files           274        274          
  Lines         18256      18264     +8   
  Methods        2834       2835     +1   
  Messages          0          0          
  Branches       2091       2092     +1   
==========================================
+ Hits          14851      14873    +22   
- Misses         2923       2924     +1   
+ Partials        482        467    -15   

Powered by Codecov. Last update 6b197e5...6283a9d

[nazim9214]

@304NotModified yes, i will change the wiki

[nazim9214]

Changed wiki: https://github.com/NLog/NLog/wiki/AutoFlushWrapper-target/_compare/2426c0be762eab38c35889c80497f1d9dbb7be2f...0b3505d8d457af555d6c1278f8096863061bdc6a

Can you review changes, please?

[304NotModified]

looks great, I have enabled syntax highlighting :)

[304NotModified]

Thanks!

[snakefoot]

New property FlushOnConditionOnly has been added to AutoFlushWrapper in NLog 4.6.6 . See also #3513

It ensures that messages are NOT flushed when calling NLog.LogManager.Flush() or NLog.LogManager.Shutdown()