A buffer whose file was deleted on disk is dirty, and Del asks first

A file deleted under an open buffer left dirty 0 and let Del, Exit and the rest throw the only copy of its text away unasked. It now counts as dirty, as acme's does, and the refusals ask about it.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

1 files changed, 12 insertions, 7 deletions

diff --git a/src/builtins.zig b/src/builtins.zig
index b0499dc0..ca01e0fe 100644
--- a/src/builtins.zig
+++ b/src/builtins.zig
@@ -536,13 +536,18 @@ fn warnModifiedIn(c: Ctx, asking: Pane.Discarding, which: Asked) bool {
         // under 100 bytes it is not asked about, as acme's winclean does not
         // whine about a small unnamed window, nor about a command's output.
         const scratch = if (f.output) |o| o.from == .cmd and o.from.cmd == .New else false;
-        if (f.revision == f.saved_revision or !(panes.Output.fileTraits(f.output).saves or scratch)) continue;
-        if (f.output != null and f.content.len < 100) continue;
-        // Dirty by a rename alone is no text to lose, as get says (ctl.zig).
-        // Nor is a buffer never edited at all: its first edit is what keeps
-        // the text it had (File.zig), so with none there is nothing to lose.
-        const saved = f.saved_hash orelse continue;
-        if (std.hash.Wyhash.hash(0, f.content) == saved) continue;
+        // A file deleted on disk is asked about, edited or not: its text is
+        // nowhere else now (acme's winclean asks the same).
+        const gone = f.disk_gone and f.output == null;
+        if (!gone) {
+            if (f.revision == f.saved_revision or !(panes.Output.fileTraits(f.output).saves or scratch)) continue;
+            if (f.output != null and f.content.len < 100) continue;
+            // Dirty by a rename alone is no text to lose, as get says (ctl.zig).
+            // Nor is a buffer never edited at all: its first edit is what keeps
+            // the text it had (File.zig), so with none there is nothing to lose.
+            const saved = f.saved_hash orelse continue;
+            if (std.hash.Wyhash.hash(0, f.content) == saved) continue;
+        }
         if (pane.discard_warned) |w| if (w.revision == f.revision and w.by == asking) continue;
         pane.discard_warned = .{ .revision = f.revision, .by = asking };
         // Scratches share a name: each is named with its pane's serial too,