Fix artisticat1#52 by force end composition

src/latex_suite.ts

@@ -14,7 +14,7 @@ import { clearSnippetQueue } from "./snippets/codemirror/snippet_queue_state_fie
 import { handleUndoRedo } from "./snippets/codemirror/history";
 
 import { handleMathTooltip } from "./editor_extensions/math_tooltip";
-import { isComposing } from "./utils/editor_utils";
+import { isComposing, forceEndComposition } from "./utils/editor_utils";
 
 export const handleUpdate = (update: ViewUpdate) => {
 	const settings = getLatexSuiteConfig(update.state);
@@ -28,7 +28,38 @@ export const handleUpdate = (update: ViewUpdate) => {
 	handleUndoRedo(update);
 }
 
+let lastKeyboardEvent: KeyboardEvent | null = null;
+let useNextTextInput = false;
+
+export const onInput = (view: EditorView, from: number, to: number, text: string) => {
+	if (text === "\0\0") {
+		return true;
+	}
+	if (text.length == 1 && useNextTextInput) {
+		const success = handleKeydown(
+			text,
+			lastKeyboardEvent.shiftKey,
+			lastKeyboardEvent.ctrlKey || lastKeyboardEvent.metaKey,
+			isComposing(view, lastKeyboardEvent),
+			view
+		);
+		if (success) {
+			forceEndComposition(view);
+			return true;
+		}
+	}
+}
+
 export const onKeydown = (event: KeyboardEvent, view: EditorView) => {
+	// the input event handler `onInput` will try to handle the unknown key.
+    if (event.key == "Unidentified" || event.key == "Process" || event.key == "Dead") {
+        useNextTextInput = true;
+		lastKeyboardEvent = event;
+		return;
+    } else {
+        useNextTextInput = false;
+    }
+
 	const success = handleKeydown(event.key, event.shiftKey, event.ctrlKey || event.metaKey, isComposing(view, event), view);
 
 	if (success) event.preventDefault();

src/main.ts

@@ -8,7 +8,7 @@ import { ICONS } from "./settings/ui/icons";
 import { getEditorCommands } from "./features/editor_commands";
 import { getLatexSuiteConfigExtension } from "./snippets/codemirror/config";
 import { SnippetVariables, parseSnippetVariables, parseSnippets } from "./snippets/parse";
-import { handleUpdate, onKeydown } from "./latex_suite";
+import { handleUpdate, onKeydown, onInput } from "./latex_suite";
 import { EditorView, tooltips } from "@codemirror/view";
 import { snippetExtensions } from "./snippets/codemirror/extensions";
 import { mkConcealPlugin } from "./editor_extensions/conceal";
@@ -163,6 +163,7 @@ export default class LatexSuitePlugin extends Plugin {
 		this.editorExtensions.push([
 			getLatexSuiteConfigExtension(this.CMSettings),
 			Prec.highest(EditorView.domEventHandlers({ "keydown": onKeydown })),
+			Prec.highest(EditorView.inputHandler.of(onInput)),
 			EditorView.updateListener.of(handleUpdate),
 			snippetExtensions,
 		]);

src/utils/editor_utils.ts

@@ -139,3 +139,38 @@ export function isComposing(view: EditorView, event: KeyboardEvent): boolean {
 	// Note that keyCode is deprecated - it is used here because it is apparently the only way to detect the first keydown event of an IME composition.
 	return view.composing || event.keyCode === 229;
 }
+
+/**
+ * Force end an IME composition.
+ * 
+ * MIT License
+ * Copyright (C) 2018-2021 by Marijn Haverbeke <marijnh@gmail.com> and others
+ */
+export function forceEndComposition(view: EditorView) {
+	let parent = view.scrollDOM.parentElement;
+	if (!parent) return;
+
+	let sibling = view.scrollDOM.nextSibling;
+	let selection = window.getSelection();
+	let savedSelection = selection && {
+		anchorNode: selection.anchorNode,
+		anchorOffset: selection.anchorOffset,
+		focusNode: selection.focusNode,
+		focusOffset: selection.focusOffset
+	};
+
+	view.scrollDOM.remove();
+	parent.insertBefore(view.scrollDOM, sibling);
+	try {
+		if (savedSelection && selection) {
+		selection.setPosition(savedSelection.anchorNode, savedSelection.anchorOffset);
+		if (savedSelection.focusNode) {
+			selection.extend(savedSelection.focusNode, savedSelection.focusOffset);
+		}
+		}
+	} catch(e) {
+		console.error(e);
+	}
+	view.focus();
+	view.contentDOM.dispatchEvent(new CustomEvent("compositionend"));
+}