Preview text files (≤8 MiB) in grid and gallery: read up to 256 KiB,
handle invalid UTF-8, skip empty files. Add unit tests.
Lets users peek at .txt without opening; size caps avoid blocking the UI.
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Closes#1798
- The %f and %u field codes may now be expanded within a word
- Handle field code escapes (%%)
- Support the %c and %k field codes
This will notably fix desktop entries and context menu actions
that pass files as a long argument, such as `--option=%f`.
tokio recommends using a sync mutex with a notifier instead of the
async mutex where possible. Rust forbids holding a sync mutex guard
across await points so we can prevent a potential deadlock this way.
This adds a custom channel based on the tokio mpmc example for
handling gvfs events from callbacks to avoid the async mutex
requirement. Messages are held in a `VecDeque` behind a sync mutex
and the receiver will get notified via the notifier when a message
is added to the queue.
Weak references used in gio callbacks in case the sender is dropped
by the application.
This caused the tab subscription to block the tokio executor.
Instead store the image dimensions in the `Item`, which is
created on a background thread.
