A Rename, references and the like tell the server of every open file of its language first, so a rename reaches files it had not seen and the preview lists them

zls renames only in the documents in its store, and syncDoc told it of
a file only when a query was asked from it, so renaming in progress.zig
left main.zig unchanged and broken, with no preview. For a query whose
answer can reach other files (rename, references, implementation,
workspace symbols, calls and type hierarchy), the host snapshots every
other open file and the client syncs those its server answers for
first. The mock server answers a rename in each document it was told
of; lsp-rename-files opens main.rs by a look, renames from lib.rs, and
its preview lists both.

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

2 files changed, 56 insertions, 0 deletions

diff --git a/test/snapshots/lsp-rename-files.golden b/test/snapshots/lsp-rename-files.golden
new file mode 100644
index 00000000..230246f6
--- /dev/null
+++ b/test/snapshots/lsp-rename-files.golden
@@ -0,0 +1,27 @@
+== snap opened grid=100x25 cursor=7,8
+|Newcol Joincol Find Grep Help Changelog Tutor Dump Themes Config Debug Exit
+|   New Tty Find Grep Joincol Delcol
+|   /tmp/pardes-snap/lsp-rename-files/cwd/lib.rs Save Tty Collapse Del TreeContext
+|     1 // main.rs
+|     2 pub fn add(a: i32, b: i32) -> i32 {
+|     3     a + b
+|     4 }
+|   /tmp/pardes-snap/lsp-rename-files/cwd/main.rs Save Tty Collapse Del TreeContext
+|     1 mod lib;
+|     2
+|     3 fn main() {
+|     4     let x = add(1, 2);
+|     5     let y = add(3, 4);
+|     6     let _ = x + y;
+|     7 }
+|     8
+== snap previewed grid=100x25 cursor=14,4
+|3:      1 // main.rs                            Rename: 3 edit(s) across files, previewed, not applied
+|15:    /tmp/pardes-snap/lsp-rename-files/cwd/+Search Save Tty Collapse Del LocationsConfig
+|16:      1 lib.rs:2:8
+|17:      2 sum
+|18:      3 main.rs:4:13-15
+|19:      4 sum
+|20:      5 main.rs:5:13-15
+|21:      6 sum
+|22:      7
diff --git a/test/snapshots/lsp-rename-files.snap b/test/snapshots/lsp-rename-files.snap
new file mode 100644
index 00000000..0114c795
--- /dev/null
+++ b/test/snapshots/lsp-rename-files.snap
@@ -0,0 +1,29 @@
+# A Rename reaches the other files open in the editor. A server renames in
+# the documents it has seen (zls's store), so before a query whose answer can
+# reach other files the client tells it of every open file of its language.
+# Here main.rs is opened by a look, asking the server nothing, and the rename
+# is asked from lib.rs: the mock answers in each document it was told of, so
+# the preview lists main.rs's two calls and lib.rs's definition.
+file lib.rs // main.rs\npub fn add(a: i32, b: i32) -> i32 {\n    a + b\n}\n
+file main.rs mod lib;\n\nfn main() {\n    let x = add(1, 2);\n    let y = add(3, 4);\n    let _ = x + y;\n}\n
+start 25 100 lib.rs
+wait 8000 pub fn add
+stable 700 20000
+press right @main.rs 4
+release right @main.rs 4
+wait 8000 let x = add
+stable 700 15000
+snap opened
+# into lib.rs's `add`, and rename it from there
+press left @add 5
+release left @add 5
+stable 400 5000
+key space
+key l
+key r
+stable 400 5000
+text sum
+key enter
+wait 10000 sum
+stable 700 15000
+snap previewed