Let a pane's tag take a row for each line it holds

A tag that is a text can hold a newline, and the tagline, the body under it
and the pointer all assumed one row. The pane's tag now takes a row per line
(up to eight, and never the body's last row); the body starts below it, the
rows a pointer counts start the body after the tag's lines, a click on any
line puts the tag's cursor there, and a pixel shell gets a tag layer per
line. A tag of one line draws exactly as before.

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

1 files changed, 5 insertions, 1 deletions

diff --git a/src/panes.zig b/src/panes.zig
index 720f655f..6887008c 100644
--- a/src/panes.zig
+++ b/src/panes.zig
@@ -25,7 +25,7 @@ pub const EditText = struct { text: []u8, row0: i32 };
 
 pub const Pane = struct {
     /// One mouse selection (block-shaped), per button. c/r are text-area relative;
-    /// r counts from the tag row (body starts at BOX_H).
+    /// 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,
@@ -121,6 +121,10 @@ pub const Pane = struct {
     focus: Focus = .body,
     /// Display columns hidden to reveal the tag caret; tag addresses stay whole.
     tag_scroll: u16 = 0,
+    /// Rows the tag takes on screen: one per line of it, as many as the pane
+    /// has room for with a body row to spare. Set with the geometry in sync.
+    /// Pointer rows count from the tag's first, so a body starts at this one.
+    tag_rows: u16 = 1,
     cwd: Cwd = .none,
     hscroll: i32 = 0,
     // Visible rows map to source lines and raw/display column origins.