Optimization step 3 - Fix vanishing images

[JorisBodin]

See this issues #5150 when getFileByPath(updatedFile.getRemotePath()) is removed in RefreshFolderOperation

For improve is this check #4647
(It is discussed in #5086)
I haven't found an optimization solution for this case. 😞

Benchmark
But if we remove it
Insert (first download):
1 seconds.

Update (refresh):
5 seconds