Fix up landed PRs from review

- #178: ToUnicode ranges looked up without indexing
- #465: frame_num gaps are concealed (bounded) even when the SPS forbids them; cut streams keep playing
- #471: control request lines up to 256 MB so picture/media inserts still fit
- #473: a merge that loses its only row or column is removed, with regression tests
- #521: AutoCorrect no longer rewrites real words (cant, wont, im)
- #654: inherit_placeholder_geometry's doc comment back on its function

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/deckcraft/src/control_server.rs

@@ -35,7 +35,8 @@ impl Default for Limits {
     fn default() -> Self {
         Self {
             max_clients: 16,
-            max_line: 16 * 1024 * 1024,
+            // Picture and media inserts carry base64 payloads: room for files of about 190 MB.
+            max_line: 256 * 1024 * 1024,
             queue: 64,
             idle_timeout: Duration::from_secs(600),
             write_timeout: Duration::from_secs(30),

crates/engine/src/cmd/text.rs

@@ -368,8 +368,6 @@ pub const AUTOCORRECT: &[(&str, &str)] = &[
     ("dont", "don't"),
     ("doesnt", "doesn't"),
     ("didnt", "didn't"),
-    ("cant", "can't"),
-    ("wont", "won't"),
     ("isnt", "isn't"),
     ("embarass", "embarrass"),
     ("enviroment", "environment"),
@@ -379,7 +377,6 @@ pub const AUTOCORRECT: &[(&str, &str)] = &[
     ("goverment", "government"),
     ("happend", "happened"),
     ("i", "I"),
-    ("im", "I'm"),
     ("ive", "I've"),
     ("immediatly", "immediately"),
     ("independant", "independent"),

crates/h264/src/decoder.rs

@@ -476,9 +476,8 @@ impl Decoder {
         } else {
             let max = sps.max_frame_num();
             if sh.frame_num != self.prev_ref_frame_num && sh.frame_num != (self.prev_ref_frame_num + 1) % max {
-                // A gap is only legal when the SPS allows it (7.4.2.1.1); otherwise the stream is broken
-                // and filling it would only cost work, so the picture is rejected.
-                ensure!(sps.gaps_in_frame_num_allowed, "frame_num gap in a stream that does not allow gaps");
+                // A gap is only legal when the SPS allows it (7.4.2.1.1), but a cut or lossy stream has
+                // them anyway: those are concealed too rather than dropping the picture.
                 // frame_num gap (8.2.5.2): insert "non-existing" frames. Their samples are never used by
                 // conforming streams; copy the latest decoded frame for concealment.
                 let meta = Arc::new(output_meta(sps, pts, false));

crates/h264/src/synth_tests.rs

@@ -592,12 +592,13 @@ fn gap_stream(gaps: bool) -> Vec<u8> {
 }
 
 #[test]
-fn frame_num_gap_is_rejected_when_the_sps_forbids_gaps() {
+fn frame_num_gap_is_concealed_even_when_the_sps_forbids_gaps() {
+    // A cut or lossy stream: the gap is filled (bounded) instead of dropping the picture.
     let mut dec = Decoder::with_threads(1);
-    let res = dec.decode(&gap_stream(false), 0);
-    let _ = dec.flush();
-    assert!(res.is_err() || dec.take_error().is_some(), "a forbidden gap must be reported");
-    assert_eq!(dec.stats().frame_num_gaps, 0);
+    let mut out = dec.decode(&gap_stream(false), 0).unwrap();
+    out.extend(dec.flush());
+    assert_eq!(out.len(), 2);
+    assert_eq!(dec.stats().frame_num_gaps, 1);
 }
 
 #[test]

crates/model/src/table.rs

@@ -321,7 +321,8 @@ impl Merge {
         } else {
             self
         };
-        (m.rs > 1 || m.gs > 1).then_some(m)
+        // A merge that lost its only row or column is gone, not a 0-span merge over its neighbours.
+        (m.rs >= 1 && m.gs >= 1 && (m.rs > 1 || m.gs > 1)).then_some(m)
     }
     fn delete_col(self, at: usize) -> Option<Self> {
         let m = if at < self.c {
@@ -331,7 +332,8 @@ impl Merge {
         } else {
             self
         };
-        (m.rs > 1 || m.gs > 1).then_some(m)
+        // A merge that lost its only row or column is gone, not a 0-span merge over its neighbours.
+        (m.rs >= 1 && m.gs >= 1 && (m.rs > 1 || m.gs > 1)).then_some(m)
     }
 }
 
@@ -552,6 +554,22 @@ mod tests {
         assert_topology(&t);
     }
 
+    #[test]
+    fn deleting_the_only_row_or_column_of_a_merge_removes_it() {
+        // A 1x3 merge across a row: deleting that row leaves no merge behind.
+        let mut t = Table::new(3, 3, 300.0, 30.0);
+        assert!(t.merge(1, 0, 1, 2));
+        assert!(t.delete_row(1));
+        assert!((0..t.n_rows()).all(|r| (0..t.n_cols()).all(|c| t.cell(r, c).is_some_and(|x| !x.is_covered() && x.grid_span <= 1))));
+        assert_topology(&t);
+        // A 3x1 merge down a column: deleting that column leaves no merge behind.
+        let mut t = Table::new(3, 3, 300.0, 30.0);
+        assert!(t.merge(0, 1, 2, 1));
+        assert!(t.delete_col(1));
+        assert!((0..t.n_rows()).all(|r| (0..t.n_cols()).all(|c| t.cell(r, c).is_some_and(|x| !x.is_covered() && x.row_span <= 1))));
+        assert_topology(&t);
+    }
+
     #[test]
     fn insert_delete_merge_split() {
         let mut t = Table::new(3, 3, 300.0, 30.0);

crates/pdf/src/lib.rs

@@ -467,7 +467,7 @@ impl Exporter<'_> {
                 .enumerate()
                 .map(|(gi, g)| {
                     let next = run.glyphs.get(gi + 1).map_or(g.1 + run.face.advance(g.0) * run.size / run.face.upem.max(1.0), |nx| nx.1);
-                    let range = ranges[gi].clone();
+                    let range = ranges.get(gi).cloned().unwrap_or(text.len()..text.len());
                     KrillaGlyph::new(GlyphId::new(g.0), ((next - g.1) / run.size) as f32, 0.0, ((g.2 - y0) / run.size) as f32, 0.0, range, None)
                 })
                 .collect();

crates/pptx/src/read/mod.rs

@@ -745,10 +745,6 @@ pub fn color_map(cm: &El) -> Vec<(String, String)> {
     cm.attrs.iter().filter(|(k, _)| !k.starts_with("xmlns")).map(|(k, v)| (k.clone(), v.clone())).collect()
 }
 
-/// Placeholders read without a geometry (an empty custom geometry, see `shapes::sp`) take the
-/// geometry of the layout or master placeholder they inherit from, as PowerPoint draws them: a
-/// layout's picture placeholder cut into a shape keeps that shape on the slide. Anything left
-/// is a rectangle.
 /// The anchor the theme's shape defaults (`a:objectDefaults/a:spDef/a:bodyPr`) give new shapes
 /// text, if any.
 fn theme_shape_anchor(t: &deckcraft_model::Theme) -> Option<deckcraft_model::text::Anchor> {
@@ -796,6 +792,10 @@ fn default_text_anchor(p: &mut Presentation) {
     }
 }
 
+/// Placeholders read without a geometry (an empty custom geometry, see `shapes::sp`) take the
+/// geometry of the layout or master placeholder they inherit from, as PowerPoint draws them: a
+/// layout's picture placeholder cut into a shape keeps that shape on the slide. Anything left
+/// is a rectangle.
 fn inherit_placeholder_geometry(p: &mut Presentation) {
     let unset = |g: &Geom| matches!(g, Geom::Custom { paths } if paths.is_empty());
     // Masters first, then layouts (from their masters), then slides (from layouts and masters).