diff -r 998b44b2c5f1 -r f02878f30f91 pidgin/pidginimwindow.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pidgin/pidginimwindow.c	Tue Jan 02 00:36:32 2024 -0600
@@ -0,0 +1,143 @@
+/*
+ * Pidgin - Internet Messenger
+ * Copyright (C) Pidgin Developers <devel@pidgin.im>
+ *
+ * Pidgin is the legal property of its developers, whose names are too numerous
+ * to list here.  Please refer to the COPYRIGHT file distributed with this
+ * source distribution.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <purple.h>
+
+#include "pidginimwindow.h"
+
+#include "pidginaccountrow.h"
+
+struct _PidginIMWindow {
+	AdwMessageDialog parent;
+
+	GtkCustomFilter *filter;
+
+	GtkWidget *account;
+	GtkWidget *username;
+};
+
+/******************************************************************************
+ * Helpers
+ *****************************************************************************/
+static gboolean
+pidgin_im_window_filter_accounts(gpointer item, G_GNUC_UNUSED gpointer data) {
+	if(PURPLE_IS_ACCOUNT(item)) {
+		PurpleAccount *account = PURPLE_ACCOUNT(item);
+		PurpleProtocol *protocol = purple_account_get_protocol(account);
+
+		if(PURPLE_IS_PROTOCOL(protocol)) {
+			return PURPLE_PROTOCOL_IMPLEMENTS(protocol, CONVERSATION,
+			                                  send_message_async);
+		}
+	}
+
+	return FALSE;
+
+}
+
+/******************************************************************************
+ * Callbacks
+ *****************************************************************************/
+static void
+pidgin_im_window_username_changed_cb(GtkEditable *self, gpointer data) {
+	const char *text = NULL;
+	gboolean enabled = FALSE;
+
+	text = gtk_editable_get_text(self);
+	enabled = !purple_strempty(text);
+
+	adw_message_dialog_set_response_enabled(data, "okay", enabled);
+}
+
+static void
+pidgin_im_window_response_cb(AdwMessageDialog *self,
+                             const char *response,
+                             G_GNUC_UNUSED gpointer data)
+{
+	PidginIMWindow *window = PIDGIN_IM_WINDOW(self);
+	PurpleAccount *account = NULL;
+	PurpleConversation *im = NULL;
+	PurpleConversationManager *manager = NULL;
+	const char *username = NULL;
+
+	if(!purple_strequal(response, "okay")) {
+		return;
+	}
+
+	account = pidgin_account_row_get_account(PIDGIN_ACCOUNT_ROW(window->account)) ;
+	username = gtk_editable_get_text(GTK_EDITABLE(window->username));
+
+	manager = purple_conversation_manager_get_default();
+	im = purple_conversation_manager_find_im(manager, account, username);
+
+	if(!PURPLE_IS_IM_CONVERSATION(im)) {
+		/* This constructor automagically registers the conversation with the
+		 * manager.
+		 */
+		purple_im_conversation_new(account, username);
+	}
+}
+
+/******************************************************************************
+ * GObject Implementation
+ *****************************************************************************/
+G_DEFINE_TYPE(PidginIMWindow, pidgin_im_window, ADW_TYPE_MESSAGE_DIALOG)
+
+static void
+pidgin_im_window_init(PidginIMWindow *window) {
+	gtk_widget_init_template(GTK_WIDGET(window));
+
+	gtk_custom_filter_set_filter_func(window->filter,
+	                                  pidgin_im_window_filter_accounts,
+	                                  NULL, NULL);
+}
+
+static void
+pidgin_im_window_class_init(PidginIMWindowClass *klass) {
+	GtkWidgetClass *widget_class = GTK_WIDGET_CLASS(klass);
+
+	gtk_widget_class_set_template_from_resource(
+		widget_class,
+		"/im/pidgin/Pidgin3/imwindow.ui"
+	);
+
+	gtk_widget_class_bind_template_child(widget_class, PidginIMWindow,
+	                                     filter);
+
+	gtk_widget_class_bind_template_child(widget_class, PidginIMWindow,
+	                                     account);
+	gtk_widget_class_bind_template_child(widget_class, PidginIMWindow,
+	                                     username);
+
+	gtk_widget_class_bind_template_callback(widget_class,
+	                                        pidgin_im_window_username_changed_cb);
+	gtk_widget_class_bind_template_callback(widget_class,
+	                                        pidgin_im_window_response_cb);
+}
+
+/******************************************************************************
+ * Public API
+ *****************************************************************************/
+GtkWidget *
+pidgin_im_window_new(void) {
+	return g_object_new(PIDGIN_TYPE_IM_WINDOW, NULL);
+}