Everything a B1 chord does while B1 is down is one undo step

B1-B2 then B1-B3 cut and pasted as two undo steps. acme marks the file once per B1 hold (text.c:881, textselect), so the pair is a copy. The chord now takes one undo point when it begins and its edits share it until B1 comes up.

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

1 files changed, 6 insertions, 0 deletions

diff --git a/src/mouse.zig b/src/mouse.zig
index ac3e206b..61bd30e0 100644
--- a/src/mouse.zig
+++ b/src/mouse.zig
@@ -790,6 +790,7 @@ fn dragRelease(p: *Pardes, button: Mouse.Button) void {
     // stream; only the button which began this gesture may end it.
     if (p.drag.button() != button) return;
     defer p.drag = .none;
+    defer p.chord_hold = false;
     switch (p.drag) {
         .border_v => |d| {
             const c = d.left_col;
@@ -1027,6 +1028,11 @@ fn chordCutPaste(p: *Pardes, cut: bool) void {
     }
     if (!s.chorded) {
         s.chorded = true;
+        // Everything done while B1 stays down is one undo step, as acme
+        // marks the file once per B1 hold (text.c:881 textselect, `state`
+        // and its one filemark): B1-B2 then B1-B3 is a copy.
+        edit.pushUndo(p, &pane.body);
+        p.chord_hold = true;
         const sl = pane.sel[sel_slot];
         pane.sel[sel_slot].state = .none;
         const pfx: i32 = if (pane.file != null) panes.File.gutterWidth(pane) else 0;