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# libghostty-vt local patches
This file tracks intentional local changes applied on top of the vendored
`libghostty-vt` source. Remove a patch only when the vendored source commit
contains the upstream fix and the listed verification still passes.
## 0001 backport resizeCols cursor subtraction saturation
status: active
patch: `vendor/patches/libghostty-vt/0001-backport-resizecols-cursor-subtraction.patch`
herdr issue: https://github.com/ogulcancelik/herdr/issues/465
upstream discussion: https://github.com/ghostty-org/ghostty/discussions/12905
upstream pr: https://github.com/ghostty-org/ghostty/pull/12907
introduced upstream: `c44afa625`
vendored base: `0f7cd84b880b203c98683e520e84b9db0c5938d8`
local files:
- `vendor/libghostty-vt/src/terminal/PageList.zig`
- `vendor/libghostty-vt/src/terminal/c/terminal.zig`
reason: shrinking rows and columns in one resize can leave the pre-resize
cursor row past the new row count. `PageList.resizeCols` then computed rows
below the cursor with checked unsigned subtraction and aborted in safety builds.
remove when: the vendored source commit contains upstream PR #12907 and the
local ReleaseSafe resize regression tests pass without this patch.
verification:
```sh
zig build test-lib-vt -Demit-lib-vt -Doptimize=ReleaseSafe -Dtest-filter="resize shrinks both axes with cursor at bottom"
zig build test-lib-vt -Demit-lib-vt -Doptimize=ReleaseSafe -Dtest-filter="PageList resize less rows and cols cursor at bottom"
```
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