Philip Withnall a2811a5236 glocalfilemonitor: Keep a weak ref to the monitor in GFileMonitorSource
Previously we were keeping a pointer to the `GFileMonitor` in a
`GFileMonitorSource` instance, but since we weren’t keeping a strong
reference, that `GFileMonitor` instance could be finalised from another
thread at any point while the source was referring to it. Not good.

Use a weak reference, and upgrade it to a strong reference whenever the
`GFileMonitorSource` is referring to the file monitor.

Signed-off-by: Philip Withnall <withnall@endlessm.com>

Helps: #1903
2019-10-18 16:59:50 +01:00
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