A mouse sweep selects a stream, as acme's does, not a rectangle

A B1, B2 or B3 drag over several lines took the same columns from every row, a block. acme's sweep is a stream (libframe/frselect.c:115-140, frselectpaint; acme text.c:881, textselect): the first row from the press to its end, the rows between whole, the last from its start to the release. edit.sweepCols says which columns of a row a sweep takes; the captured spans, the text a sweep yields (copy, chords, B2 and B3 operands, a terminal's automatic yank) and the highlight all follow it, in bodies, multi-row tags, terminals and text-rendered PDFs; a row the sweep runs through is highlighted to the edge, and rows after the first leave out the line numbers. Native PDF selection was already MuPDF's stream. No pane keeps a rectangle. exec-bigdrag's golden changes: its middle sweep now runs whole lines.

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

1 files changed, 9 insertions, 4 deletions

diff --git a/src/panes.zig b/src/panes.zig
index a7e5c668..e4621311 100644
--- a/src/panes.zig
+++ b/src/panes.zig
@@ -27,8 +27,10 @@ pub const Pane = struct {
     /// The words that throw unsaved text away (builtins.zig warnModified).
     pub const Discarding = enum { Exit, Restore, get };
 
-    /// One mouse selection (block-shaped), per button. c/r are text-area relative;
-    /// r counts from the tag's first row (the body starts at Pane.tag_rows).
+    /// One mouse sweep, per button: the press (c0, r0) and where it is now
+    /// (c1, r1), a stream between them as acme's (edit.sweepCols). c/r are
+    /// text-area relative; r counts from the tag's first row (the body
+    /// starts at Pane.tag_rows).
     pub const Sel = struct {
         state: enum { none, dragging, done } = .none,
         source_id: u64 = 0,
@@ -38,12 +40,15 @@ pub const Pane = struct {
         r1: i32 = 0,
     };
 
-    /// A rectangle keeps one source span per rendered row. Wrapped segments
-    /// remain separate rows when copied, even when they share a source line.
+    /// A captured sweep keeps one source span per rendered row. Wrapped
+    /// segments remain separate rows when copied, even when they share a
+    /// source line.
     pub const PointerRow = struct {
         row: i32,
         lo: usize,
         hi: usize,
+        /// Not the sweep's last row: its highlight runs to the right edge.
+        to_edge: bool = false,
         prefix: [32]u8 = @splat(0),
         prefix_len: u8 = 0,
         raw_terminal: bool = false,