One Look path: Enter, Tab and a bare Look take what a click at the cursor takes, a diff line's address included, and an event reader is told of them as of a click

The keyboard expanded the cursor's word on its own (look.expandedSel), so
a diff line's address (and a hunk line's code word, without its +/-) was
the mouse's alone: Enter on `+line` looked for the text in the diff. Now
exec.operandAt is the one expansion: pointerOperand is it with a gesture's
selection borrowed, the Enter/Tab path and a bare Look (exec.currentOperand)
are it from the cursor, and both dispatch through mouse.dispatchPointerBuiltin,
so a pane with an event reader hears a key's look or exec as a click's.
A test runs one diff line and one file:12:5: line through a B3 click, a B3
sweep, Enter, a bare Look, the look file and an event write-back, and asserts
each lands in the same file, line and column.

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

1 files changed, 4 insertions, 1 deletions

diff --git a/src/builtins.zig b/src/builtins.zig
index cca7bfb5..1a2f132f 100644
--- a/src/builtins.zig
+++ b/src/builtins.zig
@@ -516,7 +516,10 @@ pub const Look = struct {
     // name on the message row would only be noise over that
     pub const quiet = true;
     pub fn run(c: Ctx) void {
-        look.lookAt(c.p, c.id, c.arg orelse return);
+        // Bare (a key bound to it, a tag's Look with nothing held): the
+        // selection, else what Enter on the cursor takes, the one expansion.
+        const arg = c.arg orelse (exec.currentOperand(c.p, c.pane) orelse return);
+        look.lookAt(c.p, c.id, arg);
     }
 };