K and Alt-K keep or drop the ranges a regex matches in; Alt-: turns every range forward

K and Alt-K share the s/S prompt, which now carries a mode rather than a
split flag: a range stays when a match starts inside it (K) or when none does
(Alt-K), the primary becomes the first, and keeping none leaves the selection
as it was (helix keep_or_remove_matches). Alt-: is ensure_selections_forward.

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

1 files changed, 9 insertions, 0 deletions

diff --git a/src/Text.zig b/src/Text.zig
index 56ee199b..411c2ec8 100644
--- a/src/Text.zig
+++ b/src/Text.zig
@@ -328,6 +328,15 @@ pub fn multiSelAction(t: *Text, text: []const u8, kind: modal.Normal.Multi, cnt:
         }
         return setRanges(t, text, out[0..m], &.{}, pri, expl);
     }
+    if (kind == .ensure_forward) {
+        // helix ensure_selections_forward: every range points forward
+        for (rs[0..n]) |*r| {
+            const from = @min(r.anchor, r.head);
+            r.head = @max(r.anchor, r.head);
+            r.anchor = from;
+        }
+        return setRanges(t, text, rs[0..n], &.{}, got.pri, expl);
+    }
     if (kind == .split_newline) {
         // helix selection::split_on_newline — one range per line the
         // selection covers, the newlines themselves left out