feat(vterm): forward <escape> to the pty in vterm-mode

`<escape>' is bound globally to `keyboard-escape-quit' in
modules/keybindings.el, so Emacs swallows the key before it can reach the
pty. Bind it in vterm-mode-map to cj/vterm-send-escape, which writes a
literal ESC byte via vterm-send-string. tmux's copy-mode `cancel' binding
then fires; vi-mode exits, fzf cancel, etc., also work as expected.

1 files changed, 15 insertions, 0 deletions

diff --git a/tests/test-vterm-tmux-history.el b/tests/test-vterm-tmux-history.el
index be654905..88bd5593 100644
--- a/tests/test-vterm-tmux-history.el
+++ b/tests/test-vterm-tmux-history.el
@@ -352,6 +352,21 @@ its own copy-mode against the full pane history."
       (cj/vterm-mouse-wheel-down)
       (should (equal sent '("\e[<65;1;1M"))))))
 
+(ert-deftest test-vterm-send-escape-writes-esc-byte ()
+  "Normal: `cj/vterm-send-escape' forwards a literal ESC byte to the pty so
+tmux copy-mode, vi-mode exits, etc., can see the key past Emacs's global
+`<escape>' → `keyboard-escape-quit' binding."
+  (let ((sent nil))
+    (cl-letf (((symbol-function 'vterm-send-string)
+               (lambda (s &optional _paste-p) (push s sent))))
+      (cj/vterm-send-escape)
+      (should (equal sent '("\e"))))))
+
+(ert-deftest test-vterm-escape-binding-installed-on-vterm-mode-map ()
+  "Normal: `<escape>' in `vterm-mode-map' routes through `cj/vterm-send-escape'."
+  (should (eq (keymap-lookup vterm-mode-map "<escape>")
+              #'cj/vterm-send-escape)))
+
 (ert-deftest test-vterm-wheel-bindings-installed-on-vterm-mode-map ()
   "Normal: wheel-up / wheel-down (and X11 mouse-4 / mouse-5) route to the
 forwarding commands so tmux can see them via `set -g mouse on'."