windows: fall back to `edit`, not to a notepad window

`C-a e` on a Windows with no editor installed opened notepad, which is
a GUI program: the pane it was spawned in drew nothing, so the split
sat there empty while the config opened in a window somewhere else.
The toast said as much, but a pane you have to be told to ignore is
still the wrong answer.

Windows 11 24H2 ships Microsoft Edit as `edit`, and it is a console
program -- it fills the pane like nvim or nano would, so the fallback
now has the same shape as the thing it is falling back from, and a
first-time user gets a usable editor without installing one.

It goes last of the console editors rather than first. Having fetched
nvim is a statement of preference; having been shipped `edit` says
nothing about what you want, so anything you chose yourself outranks
it. notepad stays behind it: `edit` is not on Windows 10, or on 11
before 24H2, and something that opens is better than nothing when the
alternative is an empty pane.

sl_which() already tries .exe, so it is found as installed; the search
still only runs when neither EDITOR nor the config asked for anything.

2 files changed, 24 insertions, 8 deletions

diff --git a/docs/windows.md b/docs/windows.md
index 9e1975f..12b4a8c 100644
--- a/docs/windows.md
+++ b/docs/windows.md
@@ -126,10 +126,15 @@ the session on the one program that misbehaves. Whoever finishes last frees.
   full argv without reading another process's memory, so pane titles are
   correspondingly shorter.
 - **No editor is guaranteed.** `C-a e` prefers whichever console editor is
-  actually installed — `nvim`, `vim`, `vi`, `nano`, `micro`, `hx` — because the
-  obvious fallback is the wrong shape: `notepad` is a GUI program, so a pane
-  running it draws nothing and looks broken. If none is found it still opens
-  notepad, and says so, rather than leaving you an empty pane to puzzle over.
-  `EDITOR` and the config's `editor` are honoured ahead of the search.
+  actually installed — `nvim`, `vim`, `vi`, `nano`, `micro`, `hx`, `edit` —
+  because the obvious fallback is the wrong shape: `notepad` is a GUI program,
+  so a pane running it draws nothing and looks broken. Microsoft Edit (`edit`)
+  is a console program, so it fills a pane like any other editor: from Windows
+  11 24H2 there is a usable editor without installing one. It comes last of the
+  console editors because it arrives on its own, and so says nothing about what
+  you want, where having fetched nvim does. Older Windows does not ship it, so
+  if nothing is found slosh still opens notepad, and says so, rather than
+  leaving you an empty pane to puzzle over. `EDITOR` and the config's `editor`
+  are honoured ahead of the search.
 - **`--check`, `--dump-config`, layouts, workspaces and shaders** are
   unaffected: they never touched a pty or a socket.
diff --git a/src/app_layout.c b/src/app_layout.c
index 59a00d7..5910b52 100644
--- a/src/app_layout.c
+++ b/src/app_layout.c
@@ -1511,15 +1511,26 @@ bool app_edit_config(app_t *a) {
   /* Windows has no editor it is *required* to have, and the obvious fallback
    * is the wrong shape: notepad is a GUI program, so a pane running it draws
    * nothing and looks broken. Prefer whichever console editor is actually
-   * installed, and only then fall back to opening a window.
+   * installed -- including `edit`, which recent Windows ships itself -- and
+   * only then fall back to opening a window.
    *
    * `editor` here is still whatever EDITOR or the config asked for; the search
    * only runs when nothing was asked for, or when the POSIX default of `vi`
    * came through and would not exist. */
   bool windowed = false;
   if (!editor || !*editor || strcmp(editor, "vi") == 0) {
-    static const char *const consoles[] = {"nvim",  "vim", "vi", "nano",
-                                           "micro", "hx",  NULL};
+    /* Editors somebody chose to install come first: having fetched nvim is a
+     * statement of preference, and Windows' own editor is not. `edit` --
+     * Microsoft Edit -- is last of the console editors because it is the one
+     * that arrives on its own, and so says nothing about what you want.
+     *
+     * It is still much the better fallback: it is a console program, so it
+     * fills the pane like any other editor, and a first-time user gets
+     * something usable without installing anything. It only ships from
+     * Windows 11 24H2 onwards, though, which is why notepad remains behind
+     * it rather than being replaced by it. */
+    static const char *const consoles[] = {"nvim",  "vim", "vi",   "nano",
+                                           "micro", "hx",  "edit", NULL};
     editor = NULL;
     for (int i = 0; consoles[i] && !editor; i++)
       if (sl_which(consoles[i])) editor = consoles[i];