fix(desktop): close terminal composition edge cases

Co-authored-by: npub1mprnacetjua2xx3p5eddmhxyk6wv929ymm5py8kd2xfxurxahspqqlgyta <d8473ee32b973aa31a21a65adddcc4b69cc2a8a4dee8121ecd51926e0cddbc02@buzz.block.builderlab.xyz>
Signed-off-by: npub1mprnacetjua2xx3p5eddmhxyk6wv929ymm5py8kd2xfxurxahspqqlgyta <d8473ee32b973aa31a21a65adddcc4b69cc2a8a4dee8121ecd51926e0cddbc02@buzz.block.builderlab.xyz>

desktop/src/features/terminal/TerminalSubstrate.test.mjs

@@ -131,6 +131,8 @@ test("mounted IME paths neither toggle nor emit preedit text", async () => {
   fireEvent.input(input, { target: { value: "か" } });
   assert.deepEqual(calls.input, []);
   fireEvent.compositionEnd(input, { data: "か" });
+  assert.deepEqual(calls.input, []);
+  fireEvent.input(input, { target: { value: "か" } });
   assert.deepEqual(calls.input, ["か"]);
 });
 
@@ -148,6 +150,15 @@ test("welcome survives non-intersecting frame and dismisses on input or intersec
           },
         ],
       },
+      {
+        line: 8,
+        spans: [
+          {
+            style: { fg: 0, bg: 0, flags: 0 },
+            clusters: [{ column: 70, text: "x", width: 1 }],
+          },
+        ],
+      },
     ],
     viewport: { columns: 80, generation: 1, screenLines: 24 },
   };
@@ -157,8 +168,13 @@ test("welcome survives non-intersecting frame and dismisses on input or intersec
   toggleChord();
   const input = view.getByLabelText("Terminal input");
   fireEvent.input(input, { target: { value: "x" } });
-  await waitFor(() =>
-    assert.equal(view.container.querySelector(".buzz-terminal-welcome"), null),
+  await waitFor(
+    () =>
+      assert.equal(
+        view.container.querySelector(".buzz-terminal-welcome"),
+        null,
+      ),
+    { timeout: 1_000 },
   );
 
   cleanup();
@@ -171,7 +187,7 @@ test("welcome survives non-intersecting frame and dismisses on input or intersec
           spans: [
             {
               style: { fg: 0, bg: 0, flags: 0 },
-              clusters: [{ column: 0, text: "x", width: 1 }],
+              clusters: [{ column: 30, text: "x", width: 1 }],
             },
           ],
         },

desktop/src/features/terminal/TerminalSubstrate.tsx

@@ -67,18 +67,18 @@ function welcomeRect(frame: TerminalFrame) {
 }
 
 function frameDamageRects(frame: TerminalFrame) {
-  return frame.rows
-    .filter((row) =>
-      row.spans.some((span) =>
-        span.clusters.some((cluster) => cluster.text.trim().length > 0),
-      ),
-    )
-    .map((row) => ({
-      top: row.line,
-      left: 0,
-      bottom: row.line + 1,
-      right: frame.viewport.columns,
-    }));
+  return frame.rows.flatMap((row) =>
+    row.spans.flatMap((span) =>
+      span.clusters
+        .filter((cluster) => cluster.text.trim().length > 0)
+        .map((cluster) => ({
+          top: row.line,
+          left: cluster.column,
+          bottom: row.line + 1,
+          right: cluster.column + cluster.width,
+        })),
+    ),
+  );
 }
 
 export function TerminalSubstrate({
@@ -388,13 +388,10 @@ export function TerminalSubstrate({
           autoCapitalize="off"
           autoComplete="off"
           className="buzz-terminal-input"
-          onCompositionEnd={(event) => {
+          onCompositionEnd={() => {
             handoffRef.current = reduceHandoff(handoffRef.current, {
               type: "composition-end",
             }).state;
-            const committed = event.currentTarget.value;
-            event.currentTarget.value = "";
-            sendInput(committed);
           }}
           onCompositionStart={() => {
             handoffRef.current = reduceHandoff(handoffRef.current, {