Add context menu for React textboxes to Create Parent Dialog

chrome/content/zotero/createParentDialog.js

@@ -78,3 +78,27 @@ function doManualEntry() {
 	io.dataOut = { parent: false };
 	window.close();
 }
+
+// Support context menus on HTML text boxes
+//
+// Adapted from editMenuOverlay.js in Fx68
+window.addEventListener("contextmenu", e => {
+	const HTML_NS = "http://www.w3.org/1999/xhtml";
+	let needsContextMenu =
+		e.target.ownerDocument == document &&
+		!e.defaultPrevented &&
+		e.target.parentNode.nodeName != "moz-input-box" &&
+		((["textarea", "input"].includes(e.target.localName) &&
+			e.target.namespaceURI == HTML_NS) ||
+			e.target.closest("search-textbox"));
+
+	if (!needsContextMenu) {
+		return;
+	}
+
+	let popup = document.getElementById("contentAreaContextMenu");
+	popup.openPopupAtScreen(e.screenX, e.screenY, true);
+	// Don't show any other context menu at the same time. There can be a
+	// context menu from an ancestor too but we only want to show this one.
+	e.preventDefault();
+});

chrome/content/zotero/createParentDialog.xul

@@ -5,7 +5,12 @@
 <?xml-stylesheet href="chrome://zotero-platform/content/overlay.css" type="text/css"?>
 <?xml-stylesheet href="chrome://zotero-platform/content/zotero-react-client.css"?>
 
-<!DOCTYPE window SYSTEM "chrome://zotero/locale/zotero.dtd">
+<?xul-overlay href="chrome://zotero/content/standalone/editMenuOverlay.xul"?>
+
+<!DOCTYPE dialog [
+		<!ENTITY % textcontextDTD SYSTEM "chrome://global/locale/textcontext.dtd" > %textcontextDTD;
+		<!ENTITY % zoteroDTD SYSTEM "chrome://zotero/locale/zotero.dtd"> %zoteroDTD;
+]>
 
 <dialog
 	id="zotero-parent-dialog"
@@ -23,11 +28,45 @@
 	xmlns:html="http://www.w3.org/1999/xhtml"
 	style="padding:20px 15px;width:400px;">
 
+	<script src="chrome://global/content/globalOverlay.js"/>
 	<script src="include.js"/>
 	<script src="lookup.js"/>
 	<script src="createParentDialog.js"/>
 	<script src="components/createParent/createParent.js"/>
 
+	<commandset id="mainCommandSet">
+		<commandset id="editMenuCommands"/>
+	</commandset>
+
+	<menupopup id="contentAreaContextMenu">
+		<menuitem id="context-undo"
+				  label="&undoCmd.label;"
+				  accesskey="&undoCmd.accesskey;"
+				  command="cmd_undo"/>
+		<menuseparator id="context-sep-undo"/>
+		<menuitem id="context-cut"
+				  label="&cutCmd.label;"
+				  accesskey="&cutCmd.accesskey;"
+				  command="cmd_cut"/>
+		<menuitem id="context-copy"
+				  label="&copyCmd.label;"
+				  accesskey="&copyCmd.accesskey;"
+				  command="cmd_copy"/>
+		<menuitem id="context-paste"
+				  label="&pasteCmd.label;"
+				  accesskey="&pasteCmd.accesskey;"
+				  command="cmd_paste"/>
+		<menuitem id="context-delete"
+				  label="&deleteCmd.label;"
+				  accesskey="&deleteCmd.accesskey;"
+				  command="cmd_delete"/>
+		<menuseparator id="context-sep-paste"/>
+		<menuitem id="context-selectall"
+				  label="&selectAllCmd.label;"
+				  accesskey="&selectAllCmd.accesskey;"
+				  command="cmd_selectAll"/>
+	</menupopup>
+
 	<vbox id="zotero-create-parent-container" flex="1">
 		<html:div id="create-parent" />
 	</vbox>