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tui: fix cursor desync by scanning rendered buffer

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Instead of simulating ratatui's word wrapping algorithm, scan the
rendered buffer to find the actual cursor position. This correctly
handles word wrapping, unicode widths, and any other rendering
nuances that ratatui applies.

The old code computed wrapped_height() and cursor position based on
simple character counting, which diverged from ratatui's WordWrapper
that respects word boundaries.

Now we render first, then walk the buffer counting visible characters
until we reach self.cursor. This is O(area) but the input area is
small (typically < 200 cells), so it's negligible.
This commit is contained in:
ProofOfConcept 2026-03-19 00:40:05 -04:00
parent 5308c8e3a4
commit ec79d60fbd
4 changed files with 52 additions and 133 deletions
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137
Cargo.lock generated
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@ -339,12 +339,6 @@ dependencies = [
"capnp",
]
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source = "registry+https://github.com/rust-lang/crates.io-index"
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@ -447,20 +441,6 @@ version = "1.0.4"
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[[package]]
name = "compact_str"
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@ -1350,7 +1330,7 @@ version = "0.2.24"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "cfe4fbac503b8d1f88e6676011885f34b7174f46e59956bba534ba83abded4df"
dependencies = [
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[[package]]
@ -1446,8 +1426,6 @@ version = "0.15.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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@ -1810,15 +1788,6 @@ version = "1.70.2"
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[[package]]
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@ -2007,15 +1976,6 @@ dependencies = [
"tracing-subscriber",
]
[[package]]
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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[[package]]
name = "lru"
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@ -2648,13 +2608,14 @@ dependencies = [
"glob",
"json5",
"libc",
"ratatui 0.30.0",
"ratatui",
"reqwest",
"serde",
"serde_json",
"tiktoken-rs",
"tokio",
"tui-markdown",
"unicode-width",
"walkdir",
]
@ -2701,7 +2662,7 @@ dependencies = [
"paste",
"peg",
"poc-agent",
"ratatui 0.29.0",
"ratatui",
"rayon",
"redb",
"regex",
@ -3055,27 +3016,6 @@ dependencies = [
"rand 0.9.2",
]
[[package]]
name = "ratatui"
version = "0.29.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
name = "ratatui"
version = "0.30.0"
@ -3097,17 +3037,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "5ef8dea09a92caaf73bff7adb70b76162e5937524058a7e5bff37869cbbec293"
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[[package]]
@ -3152,13 +3092,13 @@ dependencies = [
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"indoc",
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"itertools",
"line-clipping",
"ratatui-core",
"strum 0.27.2",
"strum",
"time",
"unicode-segmentation",
"unicode-width 0.2.0",
"unicode-width",
]
[[package]]
@ -3751,35 +3691,13 @@ version = "0.11.1"
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"strum_macros",
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@ -4366,7 +4284,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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@ -4414,39 +4332,22 @@ version = "1.12.0"
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