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appstream: Monitor appstream and appdata directories rather than files

Philip Withnall requested to merge pwithnall/gnome-software:xmlb-file-monitors into master

Use the new XB_BUILDER_SOURCE_FLAG_WATCH_DIRECTORY API from https://github.com/hughsie/libxmlb/pull/55 to only monitor appstream and appdata directories, rather than all O(N) files within them. This shouldn’t change functionality, but should reduce the number of file monitors in use by an order of magnitude.

In particular, it drops around 200KB of heap memory usage directly associated with those file monitors, and potentially a little more that’s indirectly associated (signal connections and closures, main context sources, etc.).

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

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