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Drag a file out of the Files tab onto the host desktop

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The Files tab could accept a drop but never produce one: getting a file
out meant "Save to host…" and a file picker. This adds the other
direction.

Two constraints shape it. `dragDropEnabled` is on — TerminalView needs
it, since the native drag-drop event is the only one carrying dropped
file paths — and it blocks HTML5 drag inside the webview, so `draggable`
plus `DataTransfer.setData("DownloadURL", …)` was never available. The
gesture is therefore pointer events into `tauri-plugin-drag`, the same
shape and the same reason as the tab strip's drag. And the file being
dragged does not exist on the host at all: it lives in a container, and
the OS can only drag a real host path.

So a drag-out is a copy first and a drag second.
`stage_container_file_for_drag` materialises the file into
`<os-temp>/triple-c-drag-out/<session>/<slot>/<name>` through the same
`fetch_container_file` the download and the viewer use, keeps the
original filename (a dropped `tmp1234` is not a file anyone wants), and
caps at the 256 MiB an upload already caps at, naming "Save to host…" in
the refusal. The path comes from Tauri's path API rather than `/tmp`,
because on Windows it is neither.

The staging directory has a lifecycle, because whole files accumulating
in the host temp dir would be the disk problem this project just fixed,
in a new place: cleared on exit inside the existing teardown (still
guarded on the main window), and reaped at startup for whatever a crash
left behind.

The copy is also an async gap in the middle of a gesture that feels
instantaneous, and the OS only adopts a drag while the button is still
down. Small files beat the pointer; large ones do not — so the staged
path is cached per entry (keyed on size and mtime, so an edited file
re-stages) and the pane says the copy is ready and to drag again, which
is an instruction rather than an apology because the retry is immediate.
A per-file slot keeps `a/notes.txt` and `b/notes.txt` from becoming the
same host path.

"Save to host…" stays exactly as it was. Drag-out is the enhancement;
a platform that refuses `startDrag` says so and points back at it.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GBq2rGum6GX7xXgsas1fDc
This commit is contained in:
shadow-test
2026-08-23 09:12:59 -07:00
co-authored by Claude Opus 5
parent bb41275cea
commit 1c834a0b08
19 changed files with 1205 additions and 26 deletions
Download Patch File Download Diff File Expand all files Collapse all files
app/src-tauri/Cargo.lock
Generated
+190 -20
View File
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[[package]]
@@ -5186,6 +5258,7 @@ dependencies = [
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@@ -5639,10 +5712,10 @@ checksum = "7130243a7a5b33c54a444e54842e6a9e133de08b5ad7b5861cd8ed9a6a5bc96a"
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[[package]]
@@ -5663,7 +5736,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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@@ -6261,7 +6431,7 @@ dependencies = [
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