Fix #5208 Remove double check in FileContentProvider #5257
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I have remove doubleCheck if insert file. Issue: #5208
syncAndUpdateFolder is called twice on the first time the application is started, the WRITE_EXTERNAL_STORAGE permission is requested. syncAndUpdateFolder is remove in onRequestPermissionsResult
And I added a synchronized for saveFolder and saveFile, because we're already checking if the file already exists. I check this with syncAndUpdateFolder called twice