A reused command pane leaves the last program's screen modes before the next command

A program that crashed out of a full screen left the command pane's emulator
in the alternate screen with mouse reports, bracketed paste or a hidden cursor
on, and the next command ran in that. Before the '% line' separator the pane
now leaves the alternate screen, turns those modes off and soft-resets
(DECSTR). The docs add that a command which clears the screen and its
scrollback erases the pane's history above it.

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

1 files changed, 6 insertions, 0 deletions

diff --git a/src/exec.zig b/src/exec.zig
index 86dba32a..8b058a12 100644
--- a/src/exec.zig
+++ b/src/exec.zig
@@ -427,6 +427,12 @@ fn runCommand(p: *Pardes, from: usize, line: []const u8) ?usize {
         pane.command_done = false;
         pane.command_status = null;
         pane.body.mode = .tty;
+        // What the last program left the emulator in goes first: the
+        // alternate screen left (only if it is there: leaving restores a
+        // saved cursor), mouse reports and bracketed paste off, the cursor
+        // shown, then a soft reset (DECSTR) for the rest.
+        if (panes.Terminal.onAlternateScreen(pane)) panes.Terminal.feedOutput(p, pane, "\x1b[?1049l");
+        panes.Terminal.feedOutput(p, pane, "\x1b[?1000l\x1b[?1002l\x1b[?1003l\x1b[?1006l\x1b[?2004l\x1b[?25h\x1b[!p");
         var buf: [command_max + 8]u8 = undefined;
         const lead = if (panes.Terminal.gridCursor(pane).x != 0) "\r\n" else "";
         panes.Terminal.feedOutput(p, pane, std.fmt.bufPrint(&buf, "{s}% {s}\r\n", .{ lead, line }) catch "%\r\n");