Fixed putMVar blocking file watcher #1746
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The call to putMVar waits until the file watcher state MVar is empty. As it's never emptied, the file watcher hangs after watching the first sub directory (typically 'Config'). This is fixed by using modifyMVar_, which doesn't hang when the MVar is full
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The call to putMVar waits until the file watcher state MVar is empty. As it's never emptied, the file watcher hangs after watching the first sub directory (typically 'Config'). This is fixed by using modifyMVar_, which doesn't hang when the MVar is full
Fixes #1714