An exec written back to event on a diff line (MX0 0) takes the word there, a header's, a hunk header's or the marker's, never the address; only a look takes it

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

1 files changed, 5 insertions, 3 deletions

diff --git a/src/ninep/events.zig b/src/ninep/events.zig
index 5b2a763e..3910ac05 100644
--- a/src/ninep/events.zig
+++ b/src/ninep/events.zig
@@ -728,11 +728,13 @@ fn scanNumber(data: []const u8, i: *usize, overflow: *bool) ?u32 {
 /// An empty range written back: what a click at `at` takes, as the mouse's
 /// does (exec.pointerOperand). In a diff pane's body that is look.diffClick's
 /// answer, the line's address or its code's words.
-pub fn expandAt(p: *Pardes, pane: *Pane, whole: []const u8, at: usize, in_body: bool) []const u8 {
+/// `for_look`: only a look in a body takes a diff line's address
+/// (exec.operandAt); an exec takes the word there, as anywhere.
+pub fn expandAt(p: *Pardes, pane: *Pane, whole: []const u8, at: usize, in_body: bool, for_look: bool) []const u8 {
     const start = if (std.mem.lastIndexOfScalar(u8, whole[0..at], '\n')) |nl| nl + 1 else 0;
     const end = std.mem.indexOfScalarPos(u8, whole, at, '\n') orelse whole.len;
     var word_from: usize = 0;
-    if (in_body) diff: {
+    if (in_body and for_look) diff: {
         const row = std.mem.count(u8, whole[0..start], "\n");
         // Only when the served line is the one the diff reads there.
         const lines = look.diffLines(p, pane) orelse break :diff;
@@ -794,7 +796,7 @@ pub fn writeEvent(p: *Pardes, asked: Req, id: usize) Reply {
         // An empty range with no text is a click at that point: expanded as
         // the click would be, to the word or file name under it (acme's
         // expand, look.c).
-        const said = if (r.q0 == r.q1) r.text orelse expandAt(p, pane, whole, lo, !r.action.onTag()) else whole[lo..hi];
+        const said = if (r.q0 == r.q1) r.text orelse expandAt(p, pane, whole, lo, !r.action.onTag(), r.action == .body_look or r.action == .tag_look) else whole[lo..hi];
         const text = p.scratch.allocator().dupe(u8, said) catch continue;
         switch (r.action) {
             // A body's click written back is done as the click would have