fix: do not block ui on dead fuse mount#2645
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os.Stat blocks indefinitely on an unresponsive filesystem such as a dead sshfs mount, and both checkDir and checkReg are reached from ui.loadFile whenever the cursor moves. lf hangs as soon as such a mount is highlighted, showing the loading message.
Reproduction is a bit difficult, I ran into this when the server of a sshfs mount killed itself in a special way and the fuse mount remained strangely broken.
But this should fix the root cause