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Kai Koehne authored
Only watch directories, and not single files. Also, share one FileSystemWatcher between projects & FileFilter items. This fixes the issue that the process runs out of file handles e.g. when loading a .qmlproject file containing all of qt examples & demos. Basic implementation of FileSystemWatcher was copied from ProjectExplorer::FileWatcher - however the FileWatcher is only for files (and not directories), and also monitors the last change date etc.
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