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, 7 insertions, 7 deletions

diff --git a/src/File.zig b/src/File.zig
index 22e3c434..262f3ebb 100644
--- a/src/File.zig
+++ b/src/File.zig
@@ -378,7 +378,7 @@ pub fn gutterWidth(pane: *const Pane) u16 {
 /// Convert between rendered cells and UTF-8 byte columns. Tag rows always
 /// need grapheme conversion; file body rows additionally skip the gutter.
 pub fn renderedLineByteCol(pane: *const Pane, row: i32, line_text: []const u8, display_col: usize) usize {
-    if (row < pardes.BOX_H) return rawAtDisplay(line_text, display_col);
+    if (row < pane.tag_rows) return rawAtDisplay(line_text, display_col);
     if (pane.file == null) return rawAtDisplay(line_text, display_col);
     const prefix = @min(@as(usize, gutterWidth(pane)), line_text.len);
     if (display_col <= prefix) return display_col;
@@ -386,7 +386,7 @@ pub fn renderedLineByteCol(pane: *const Pane, row: i32, line_text: []const u8, d
 }
 
 pub fn renderedLineDisplayCol(pane: *const Pane, row: i32, line_text: []const u8, byte_col: usize) usize {
-    if (row < pardes.BOX_H) return rawDisplayCol(line_text, byte_col);
+    if (row < pane.tag_rows) return rawDisplayCol(line_text, byte_col);
     if (pane.file == null) return rawDisplayCol(line_text, byte_col);
     const prefix = @min(@as(usize, gutterWidth(pane)), line_text.len);
     if (byte_col <= prefix) return byte_col;
@@ -1133,7 +1133,7 @@ pub fn drawGutter(p: *Pardes, pane: *Pane, r: pardes.Rect, tx: u16, tw: u16, bod
     const typing_body = pane.focus == .body and (pane.prompt == .none or pane.prompt == .del_side);
     const cur_line: i32 = if (active and typing_body) gcrow else std.math.minInt(i32);
     // the body's first row, the way renderPane derives it (Tagbottom)
-    const body_y = p.bodyTop(r);
+    const body_y = p.bodyTop(pane, r);
     const context_bg = p.theme().tag_bg;
     for (0..@min(pane.context_rows, body_h)) |context_row| {
         for (0..tw) |col| {
@@ -1187,7 +1187,7 @@ pub fn recolorSyntax(p: *Pardes, pane: *Pane, f: *State, r: pardes.Rect, tx: u16
     // indexed start, same as bodyText — an empty tail simply paints nothing
     var flines = std.mem.splitScalar(u8, f.content[lineStart(p.gpa, f, f.scroll)..], '\n');
     const total = nlines(p.gpa, f);
-    const body_y = p.bodyTop(r);
+    const body_y = p.bodyTop(pane, r);
     var vr: u16 = 0;
     while (vr < body_h) : (vr += 1) {
         var base: usize = undefined;
@@ -1263,7 +1263,7 @@ pub fn drawWrapMarkers(
     pane_bg: pardes.Color,
 ) void {
     if (tw <= gutterWidth(pane) + 1) return;
-    const body_y = p.bodyTop(r);
+    const body_y = p.bodyTop(pane, r);
     const marker_fg = p.chromeTheme().lineno;
     var row: u16 = 0;
     while (row + 1 < pane.wrap_n and row + 1 < body_h) : (row += 1) {
@@ -1287,9 +1287,9 @@ pub fn paintWordSelection(
     const tx = r.x + config.GUTTER;
     const tw = r.w - config.GUTTER;
     const prefix_width = gutterWidth(pane);
-    const body_y = p.bodyTop(r);
+    const body_y = p.bodyTop(pane, r);
     var vr: i32 = 0;
-    while (vr + @as(i32, pardes.BOX_H) < @as(i32, r.h)) : (vr += 1) {
+    while (vr + @as(i32, pane.tag_rows) < @as(i32, r.h)) : (vr += 1) {
         const here = pane.wrapAt(vr);
         if (here.line != row) continue;
         var hi = word_hi;