Commit 7381df3

fix: forward real terminal pixel size instead of hardcoding 0x0 (#174)

ipc.Resize only carried rows/cols, and getTerminalSize() dropped the
ws_xpixel/ws_ypixel fields read from TIOCGWINSZ. The daemon's three
TIOCSWINSZ call sites (spawnPty, handleInit, handleResize) then hardcoded
ws_xpixel/ws_ypixel to 0 on the inner pty, regardless of what the real
terminal reported.

This breaks Kitty graphics-protocol image sizing for anything running
inside a zmx session, since image dimensions in cells get computed from
a pixel-per-cell ratio that is always 0. nvim plugins like snacks.nvim
report `{cell}: 0 x 0 pixels` and scale images to nothing before sending
them to the terminal.

Add xpixel/ypixel to ipc.Resize, populate them from the real
ioctl(TIOCGWINSZ) result on the client side, and thread them through to
the daemon's TIOCSWINSZ calls instead of hardcoding 0.

 1@@ -38,12 +38,14 @@ pub const Header = packed struct {
 2 pub const Resize = packed struct {
 3     rows: u16,
 4     cols: u16,
 5+    xpixel: u16 = 0,
 6+    ypixel: u16 = 0,
 7 };
 8 
 9 pub fn getTerminalSize(fd: i32) Resize {
10     var ws: cross.c.struct_winsize = undefined;
11     if (cross.c.ioctl(fd, cross.c.TIOCGWINSZ, &ws) == 0 and ws.ws_row > 0 and ws.ws_col > 0) {
12-        return .{ .rows = ws.ws_row, .cols = ws.ws_col };
13+        return .{ .rows = ws.ws_row, .cols = ws.ws_col, .xpixel = ws.ws_xpixel, .ypixel = ws.ws_ypixel };
14     }
15     return .{ .rows = 24, .cols = 160 };
16 }

 1@@ -702,8 +702,8 @@ const Daemon = struct {
 2         var ws: cross.c.struct_winsize = .{
 3             .ws_row = size.rows,
 4             .ws_col = size.cols,
 5-            .ws_xpixel = 0,
 6-            .ws_ypixel = 0,
 7+            .ws_xpixel = size.xpixel,
 8+            .ws_ypixel = size.ypixel,
 9         };
10 
11         var master_fd: c_int = undefined;
12@@ -978,8 +978,8 @@ const Daemon = struct {
13             var ws: cross.c.struct_winsize = .{
14                 .ws_row = resize.rows,
15                 .ws_col = resize.cols,
16-                .ws_xpixel = 0,
17-                .ws_ypixel = 0,
18+                .ws_xpixel = resize.xpixel,
19+                .ws_ypixel = resize.ypixel,
20             };
21             _ = cross.c.ioctl(pty_fd, cross.c.TIOCSWINSZ, &ws);
22             // Disable prompt_redraw before resize. The daemon's internal terminal
23@@ -1017,8 +1017,8 @@ const Daemon = struct {
24         var ws: cross.c.struct_winsize = .{
25             .ws_row = resize.rows,
26             .ws_col = resize.cols,
27-            .ws_xpixel = 0,
28-            .ws_ypixel = 0,
29+            .ws_xpixel = resize.xpixel,
30+            .ws_ypixel = resize.ypixel,
31         };
32         _ = cross.c.ioctl(pty_fd, cross.c.TIOCSWINSZ, &ws);
33         // Disable prompt_redraw before resize (same rationale as handleInit).