Fix: don't submit comment on IME composition Enter key

src/chrome-client.js

@@ -8,6 +8,14 @@ import { tidy } from "./anchor-text.js";
 import { pageUrl, replacePage } from "./chrome-session.js";
 import { framePolicy } from "./frame-policy.js";
 
+/**
+ * True when an "Enter" keydown is really an IME confirming its composition
+ * (e.g. finalizing kanji conversion), not the user asking to submit.
+ */
+function isImeCommitEnter(event) {
+  return Boolean(event.isComposing || event.keyCode === 229);
+}
+
 const $ = (id) => document.getElementById(id);
 const frame = $("frame");
 
@@ -392,6 +400,7 @@ function editComment(card, body, comment) {
   input.addEventListener("keydown", (event) => {
     event.stopPropagation();
     if (event.key === "Enter" && !event.shiftKey) {
+      if (isImeCommitEnter(event)) return;
       event.preventDefault();
       commit();
     }
@@ -640,6 +649,7 @@ $("compose").addEventListener("mousedown", (event) => {
 
 $("composeText").addEventListener("keydown", (event) => {
   if (event.key === "Enter" && !event.shiftKey) {
+    if (isImeCommitEnter(event)) return;
     event.preventDefault();
     commitCompose();
   }
@@ -764,6 +774,7 @@ function applyTheme(dark) {
 document.addEventListener("keydown", (event) => {
   const meta = event.metaKey || event.ctrlKey;
   if (meta && event.key === "Enter") {
+    if (isImeCommitEnter(event)) return;
     event.preventDefault();
     if (!$("send").disabled) $("send").click();
     return;

src/sdk.js

@@ -10,6 +10,14 @@ import { hashClickAction, navigationHref } from "./click-target.js";
 import { linkStyleFixup, listCommandFor, listStyleFixup, normalizeHref } from "./editing.js";
 import { keepBodyEditable, serializeDocument, UI_ATTR, MARK_ATTR } from "./serialize.js";
 
+/**
+ * True when an "Enter" keydown is really an IME confirming its composition
+ * (e.g. finalizing kanji conversion), not the user asking to submit.
+ */
+function isImeCommitEnter(event) {
+  return Boolean(event.isComposing || event.keyCode === 229);
+}
+
 const SAVE_DEBOUNCE_MS = 700;
 const EDIT_FLUSH_MS = 500;
 const MEDIA = /^(img|svg|canvas|video|picture|iframe|hr|figure)$/i;
@@ -1012,6 +1020,7 @@ function boot() {
   els.linkInput.addEventListener("keydown", (event) => {
     event.stopPropagation();
     if (event.key === "Enter") {
+      if (isImeCommitEnter(event)) return;
       event.preventDefault();
       applyLink();
     } else if (event.key === "Escape") {