A language server question that finds nothing, cannot be answered or has no room fails, and so does a write to an image's or PDF's body

Callers or Callees with nothing found, Hover or Lspwhy with no room for its pane, and a question asked of no file's pane said nothing, the 9P write succeeding; a body write to an image or PDF pane went nowhere. A write that asks a language server now waits for its answer (turn.lsp_answers), and what fails there -- nothing found, no answer, a backend's @none why, a placement with no room (ENOSPC) -- fails the write and logs its err. No diagnostics is said, not failed.

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

1 files changed, 2 insertions, 0 deletions

diff --git a/src/ninep/pane.zig b/src/ninep/pane.zig
index 5ed3f6f4..fe3312b4 100644
--- a/src/ninep/pane.zig
+++ b/src/ninep/pane.zig
@@ -449,6 +449,8 @@ pub fn write(p: *Pardes, req: Req, id: usize, pane: *Pane, file: PaneFile) Reply
 fn writeBody(p: *Pardes, req: Req, id: usize, pane: *Pane) Reply {
     if (req.data.len == 0) return .{ .tag = req.tag, .written = 0 };
     if (pane.file == null) {
+        // An image's or a PDF's body is no text a write goes into.
+        if (!pane.isTerminal()) return tree.failText(req.tag, E.INVAL, e_no_text);
         const take = wholeUtf8(req.data);
         p.emitWrite(id, req.data[0..take]);
         return .{ .tag = req.tag, .written = @intCast(take) };