Select › Modify: bound the canvas-edge margin and translate Apply At Canvas Bounds

The margin Modify pads a canvas-edge selection with was twice the radius
for every operation, so Feather 1000 added 2002 px a side. It now pads by
each operation's reach (Feather 1.5 r, the others r) and refuses a padded
mask over 2^30 pixels instead of aborting on the allocation. The new
dialog option is translated in every shipped language.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01UHgFEHEsefoQoBParH47JA

crates/engine/src/selection_cmds.rs

@@ -244,8 +244,15 @@ fn modify(s: &mut Session, p: &Value, op: &str) -> Result<Value> {
     let (w, h) = (area.width() as usize, area.height() as usize);
     // Feather reaches 3σ = 1.5 r; the others reach r. A margin past that keeps the canvas edge out of
     // reach. A selection clear of the canvas edge needs none: both readings agree there.
-    let pad = if touches_edge(&m, w, h) { (r * 2.0).ceil() as usize + 2 } else { 0 };
-    let (pw, ph) = (w + 2 * pad, h + 2 * pad);
+    let reach = if op == "feather" { r * 1.5 } else { r };
+    let pad = if touches_edge(&m, w, h) { reach.ceil() as usize + 2 } else { 0 };
+    let grown = |n: usize| pad.checked_mul(2).and_then(|p| n.checked_add(p));
+    let (Some(pw), Some(ph)) = (grown(w), grown(h)) else {
+        return Err(EngineError::BadParams { cmd: format!("select.modify.{op}"), msg: "the selection is too large to modify".into() });
+    };
+    if pw.checked_mul(ph).is_none_or(|n| n > MAX_MODIFY_PIXELS) {
+        return Err(EngineError::BadParams { cmd: format!("select.modify.{op}"), msg: "the selection is too large to modify".into() });
+    }
     let padded = pad_mask(&m, w, h, pad, at_bounds);
     let out = match op {
         "expand" => sel::expand(&padded, pw, ph, r),
@@ -265,6 +272,10 @@ fn modify(s: &mut Session, p: &Value, op: &str) -> Result<Value> {
     set_selection(s, label, area, out, SelectionMode::Replace)
 }
 
+/// The largest padded mask Modify works on (a 300000 × 300000 canvas is 9e10 pixels; this caps a
+/// padded copy at ~4 GB of f32, beyond which the edit is refused rather than aborting on allocation).
+const MAX_MODIFY_PIXELS: usize = 1 << 30;
+
 /// Whether any pixel on the outermost rows or columns of `m` (`w`×`h`) is selected.
 fn touches_edge(m: &[f32], w: usize, h: usize) -> bool {
     let sel = |x: usize, y: usize| m.get(y * w + x).is_some_and(|v| *v > 0.0);

crates/ui-egui/src/i18n/cs.tsv

@@ -2134,3 +2134,4 @@ cameraRaw	Color	Barvy
 	% of all commits	% všech commitů
 	Lines +/−	Řádky +/−
 	@{login}: {prs} PRs, {commits} commits, +{added} / −{deleted} lines (Δ {delta}), +{binAdded} / −{binDeleted} binary assets, {first} – {last}	@{login}: PR: {prs}, commity: {commits}, řádky +{added} / −{deleted} (Δ {delta}), binární soubory +{binAdded} / −{binDeleted}, {first} – {last}
+	Apply At Canvas Bounds	Použít efekt na hranicích plátna

crates/ui-egui/src/i18n/de.tsv

@@ -2173,3 +2173,4 @@
 	% of all commits	% aller Commits
 	Lines +/−	Zeilen +/−
 	@{login}: {prs} PRs, {commits} commits, +{added} / −{deleted} lines (Δ {delta}), +{binAdded} / −{binDeleted} binary assets, {first} – {last}	@{login}: {prs} PRs, {commits} Commits, +{added} / −{deleted} Zeilen (Δ {delta}), +{binAdded} / −{binDeleted} Binärdateien, {first} – {last}
+	Apply At Canvas Bounds	Effekt an Arbeitsflächenbegrenzungen anwenden

crates/ui-egui/src/i18n/es.tsv

@@ -2205,3 +2205,4 @@ cameraRaw	Amount	Cantidad
 	% of all commits	% de todos los commits
 	Lines +/−	Líneas +/−
 	@{login}: {prs} PRs, {commits} commits, +{added} / −{deleted} lines (Δ {delta}), +{binAdded} / −{binDeleted} binary assets, {first} – {last}	@{login}: {prs} PR, {commits} commits, +{added} / −{deleted} líneas (Δ {delta}), +{binAdded} / −{binDeleted} archivos binarios, {first} – {last}
+	Apply At Canvas Bounds	Aplicar efecto en los límites del lienzo

crates/ui-egui/src/i18n/fr.tsv

@@ -2565,3 +2565,4 @@ cameraRaw	Blending	Fusion
 	% of all commits	% de tous les commits
 	Lines +/−	Lignes +/−
 	@{login}: {prs} PRs, {commits} commits, +{added} / −{deleted} lines (Δ {delta}), +{binAdded} / −{binDeleted} binary assets, {first} – {last}	@{login} : {prs} PR, {commits} commits, +{added} / −{deleted} lignes (Δ {delta}), +{binAdded} / −{binDeleted} fichiers binaires, {first} – {last}
+	Apply At Canvas Bounds	Appliquer l’effet aux limites de la zone de travail

crates/ui-egui/src/i18n/id.tsv

@@ -2552,3 +2552,4 @@ cameraRaw	Blending	Pembauran
 	% of all commits	% dari semua commit
 	Lines +/−	Baris +/−
 	@{login}: {prs} PRs, {commits} commits, +{added} / −{deleted} lines (Δ {delta}), +{binAdded} / −{binDeleted} binary assets, {first} – {last}	@{login}: {prs} PR, {commits} commit, +{added} / −{deleted} baris (Δ {delta}), +{binAdded} / −{binDeleted} berkas biner, {first} – {last}
+	Apply At Canvas Bounds	Terapkan efek di batas kanvas

crates/ui-egui/src/i18n/it.tsv

@@ -2207,3 +2207,4 @@ cameraRaw	Amount	Quantità
 	Lines +/−	Righe +/−
 	@{login}: {prs} PRs, {commits} commits, +{added} / −{deleted} lines (Δ {delta}), +{binAdded} / −{binDeleted} binary assets, {first} – {last}	@{login}: {prs} PR, {commits} commit, +{added} / −{deleted} righe (Δ {delta}), +{binAdded} / −{binDeleted} risorse binarie, {first} – {last}
 	Convert to Layers	Converti in livelli
+	Apply At Canvas Bounds	Applica effetto ai limiti dell’area di lavoro

crates/ui-egui/src/i18n/ja.tsv

@@ -2117,3 +2117,4 @@ cameraRaw	Color	カラー
 	% of all commits	全コミットに占める割合 (%)
 	Lines +/−	行数 +/−
 	@{login}: {prs} PRs, {commits} commits, +{added} / −{deleted} lines (Δ {delta}), +{binAdded} / −{binDeleted} binary assets, {first} – {last}	@{login}: PR {prs} 件、コミット {commits} 件、行 +{added} / −{deleted} (Δ {delta})、バイナリ +{binAdded} / −{binDeleted}、{first} – {last}
+	Apply At Canvas Bounds	カンバスの境界に効果を適用

crates/ui-egui/src/i18n/ko.tsv

@@ -2718,3 +2718,4 @@ cameraRaw	Color	색상
 	% of all commits	전체 커밋 대비 %
 	Lines +/−	줄 +/−
 	@{login}: {prs} PRs, {commits} commits, +{added} / −{deleted} lines (Δ {delta}), +{binAdded} / −{binDeleted} binary assets, {first} – {last}	@{login}: PR {prs}개, 커밋 {commits}개, 줄 +{added} / −{deleted} (Δ {delta}), 바이너리 +{binAdded} / −{binDeleted}, {first} – {last}
+	Apply At Canvas Bounds	캔버스 경계에 효과 적용

crates/ui-egui/src/i18n/pt-br.tsv

@@ -2572,3 +2572,4 @@ cameraRaw	Whites	Brancos
 	% of all commits	% de todos os commits
 	Lines +/−	Linhas +/−
 	@{login}: {prs} PRs, {commits} commits, +{added} / −{deleted} lines (Δ {delta}), +{binAdded} / −{binDeleted} binary assets, {first} – {last}	@{login}: {prs} PRs, {commits} commits, +{added} / −{deleted} linhas (Δ {delta}), +{binAdded} / −{binDeleted} arquivos binários, {first} – {last}
+	Apply At Canvas Bounds	Aplicar efeito nos limites da tela

crates/ui-egui/src/i18n/ru.tsv

@@ -2408,3 +2408,4 @@ cameraRaw	Roughness	Неровность
 	% of all commits	% от всех коммитов
 	Lines +/−	Строки +/−
 	@{login}: {prs} PRs, {commits} commits, +{added} / −{deleted} lines (Δ {delta}), +{binAdded} / −{binDeleted} binary assets, {first} – {last}	@{login}: PR: {prs}, коммиты: {commits}, строки +{added} / −{deleted} (Δ {delta}), двоичные файлы +{binAdded} / −{binDeleted}, {first} – {last}
+	Apply At Canvas Bounds	Применить эффект на границах холста

crates/ui-egui/src/i18n/zh-hans.tsv

@@ -2142,3 +2142,4 @@ cameraRaw	Blending	混合
 	% of all commits	占全部提交的 %
 	Lines +/−	行数 +/−
 	@{login}: {prs} PRs, {commits} commits, +{added} / −{deleted} lines (Δ {delta}), +{binAdded} / −{binDeleted} binary assets, {first} – {last}	@{login}：{prs} 个 PR，{commits} 次提交，行 +{added} / −{deleted}（Δ {delta}），二进制文件 +{binAdded} / −{binDeleted}，{first} – {last}
+	Apply At Canvas Bounds	应用画布边界的效果

crates/ui-egui/src/i18n/zh-hant.tsv

@@ -2111,3 +2111,4 @@ cameraRaw	Blending	混合
 	% of all commits	佔全部提交的 %
 	Lines +/−	行數 +/−
 	@{login}: {prs} PRs, {commits} commits, +{added} / −{deleted} lines (Δ {delta}), +{binAdded} / −{binDeleted} binary assets, {first} – {last}	@{login}：{prs} 個 PR，{commits} 次提交，行 +{added} / −{deleted}（Δ {delta}），二進位檔 +{binAdded} / −{binDeleted}，{first} – {last}
+	Apply At Canvas Bounds	套用效果至版面邊界