Display only one confirmation dialog when files in archive are modified
Since QFileSystemWatcher::fileChanged is emitted everytime flush() is called on a file, slotWatchedFileModified gets called multiple times, especially for large files. (see https://bugreports.qt.io/browse/QTBUG-8244)
If no new fileChanged signal is emitted 200ms after the last one, we interpret that as "the file has been fully written"
200ms was arbitrarily chosen to be a balance between a long enough flush interval and "instant" feedback to the user, but it can be fine tuned later.
This MR also removes the overwrite confirmation dialog for changed files so that only one dialog is shown per modified file.
(Also sorry for intruding the main repo, I heard that testing with branches in the main repo a bit simpler)
Edited by Jan Paul Batrina