Update view on filesystem changes (#112)

* Update view on filesystem changes

AppContext owns an INotifyWatcher, which watches the visible directories
(max. three). The list of directories to watch is updated on every
event. If a filesystem change is announced, a "soft-update" of the
current view is issued.

* Specific "watchers" for Linux and MacOS

For supervision of filesystem changes, specific `notify::Watcher`
implementations are used for Linux and MacOS.

Builds will likely fail for other OSes as
`notify::recommended_watcher` may return some specific watcher
implementation but the code just expects a `NullWatcher`.

* remove dead code

1 files changed, 1 insertions, 0 deletions

diff --git a/Cargo.toml b/Cargo.toml
index 98a6857..abc0738 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -36,6 +36,7 @@ phf = { version = "^0", features = ["macros"], optional = true }
 trash = { version = "^1", optional = true }
 unicode-segmentation = "^1"
 ansi-to-tui = "0.4.1"
+notify = "5.0.0-pre.13"
 
 [features]
 devicons = [ "phf" ]