Adaptation of https://gitlab.gnome.org/GNOME/evolution/-/issues/992 for debian bullseye

evolution-3.38.3-num993-6f9e3ed5.patch

diff -ru evolution-3.38.3/src/calendar/gui/e-comp-editor.c evolution-3.38.3-patched/src/calendar/gui/e-comp-editor.c
--- evolution-3.38.3/src/calendar/gui/e-comp-editor.c	2021-01-08 02:49:31.000000000 -0800
+++ evolution-3.38.3-patched/src/calendar/gui/e-comp-editor.c	2021-02-23 17:39:13.623163055 -0800
@@ -968,6 +968,9 @@
 		    gboolean close_after_save)
 {
 	EActivity *activity;
+	ECalComponent *comp;
+	EShell *shell;
+	ESourceRegistry *registry;
 	const gchar *summary;
 	ECalObjModType recur_mod = E_CAL_OBJ_MOD_THIS;
 	SaveData *sd;
@@ -994,12 +997,18 @@
 
 	e_comp_editor_enable (comp_editor, FALSE);
 
+	shell = e_comp_editor_get_shell (comp_editor);
+	registry = e_shell_get_registry (shell);
+	comp = e_cal_component_new_from_icalcomponent (i_cal_component_clone (component));
+
 	sd = g_slice_new0 (SaveData);
 	sd->comp_editor = g_object_ref (comp_editor);
 	sd->source_client = comp_editor->priv->source_client ? g_object_ref (comp_editor->priv->source_client) : NULL;
 	sd->target_client = g_object_ref (comp_editor->priv->target_client);
 	sd->component = i_cal_component_clone (component);
-	sd->with_send = with_send;
+	sd->with_send = with_send && (!itip_has_any_attendees (comp) ||
+		    (itip_organizer_is_user (registry, comp, sd->target_client) ||
+		     itip_sentby_is_user (registry, comp, sd->target_client)));
 	sd->close_after_save = close_after_save;
 	sd->recur_mod = recur_mod;
 	sd->first_send = E_CAL_COMPONENT_METHOD_NONE;
@@ -1016,6 +1025,7 @@
 	if (activity)
 		e_activity_bar_set_activity (comp_editor->priv->activity_bar, activity);
 
+	g_clear_object (&comp);
 	g_clear_object (&activity);
 	g_free (source_display_name);
 }
diff -ru evolution-3.38.3/src/calendar/gui/e-comp-editor-event.c evolution-3.38.3-patched/src/calendar/gui/e-comp-editor-event.c
--- evolution-3.38.3/src/calendar/gui/e-comp-editor-event.c	2021-01-08 02:49:31.000000000 -0800
+++ evolution-3.38.3-patched/src/calendar/gui/e-comp-editor-event.c	2021-02-23 17:29:37.236349208 -0800
@@ -168,16 +168,16 @@
 	is_organizer = (flags & (E_COMP_EDITOR_FLAG_IS_NEW | E_COMP_EDITOR_FLAG_ORGANIZER_IS_USER)) != 0;
 	event_editor = E_COMP_EDITOR_EVENT (comp_editor);
 
-	gtk_widget_set_sensitive (event_editor->priv->all_day_check, !force_insensitive && is_organizer);
+	gtk_widget_set_sensitive (event_editor->priv->all_day_check, !force_insensitive);
 
 	#define sensitize_part(x) G_STMT_START { \
 		widget = e_comp_editor_property_part_get_label_widget (x); \
 		if (widget) \
-			gtk_widget_set_sensitive (widget, !force_insensitive && is_organizer); \
+			gtk_widget_set_sensitive (widget, !force_insensitive); \
 		\
 		widget = e_comp_editor_property_part_get_edit_widget (x); \
 		if (widget) \
-			gtk_widget_set_sensitive (widget, !force_insensitive && is_organizer); \
+			gtk_widget_set_sensitive (widget, !force_insensitive); \
 	} G_STMT_END
 
 	sensitize_part (event_editor->priv->dtstart);
@@ -194,10 +194,10 @@
 	gtk_widget_set_sensitive (edit_widget, TRUE);
 
 	action = e_comp_editor_get_action (comp_editor, "all-day-event");
-	gtk_action_set_sensitive (action, !force_insensitive && is_organizer);
+	gtk_action_set_sensitive (action, !force_insensitive);
 
 	action = e_comp_editor_get_action (comp_editor, "classification-menu");
-	gtk_action_set_sensitive (action, !force_insensitive && is_organizer);
+	gtk_action_set_sensitive (action, !force_insensitive);
 
 	if (event_editor->priv->insensitive_info_alert)
 		e_alert_response (event_editor->priv->insensitive_info_alert, GTK_RESPONSE_OK);
@@ -212,7 +212,7 @@
 		else if (e_client_is_readonly (E_CLIENT (client)))
 			message = _("Event cannot be edited, because the selected calendar is read only");
 		else if (!is_organizer)
-			message = _("Event cannot be fully edited, because you are not the organizer");
+			message = _("Changes made to the event will not be sent to the attendees, because you are not the organizer");
 
 		if (message) {
 			EAlert *alert;
diff -ru evolution-3.38.3/src/calendar/gui/e-comp-editor-memo.c evolution-3.38.3-patched/src/calendar/gui/e-comp-editor-memo.c
--- evolution-3.38.3/src/calendar/gui/e-comp-editor-memo.c	2021-01-08 02:49:31.000000000 -0800
+++ evolution-3.38.3-patched/src/calendar/gui/e-comp-editor-memo.c	2021-02-23 17:30:57.068795059 -0800
@@ -220,7 +220,7 @@
 		else if (e_client_is_readonly (E_CLIENT (client)))
 			message = _("Memo cannot be edited, because the selected memo list is read only");
 		else if (!is_organizer)
-			message = _("Memo cannot be fully edited, because you are not the organizer");
+			message = _("Changes made to the memo will not be sent to the attendees, because you are not the organizer");
 
 		if (message) {
 			EAlert *alert;
diff -ru evolution-3.38.3/src/calendar/gui/e-comp-editor-page-attachments.c evolution-3.38.3-patched/src/calendar/gui/e-comp-editor-page-attachments.c
--- evolution-3.38.3/src/calendar/gui/e-comp-editor-page-attachments.c	2021-01-08 02:49:31.000000000 -0800
+++ evolution-3.38.3-patched/src/calendar/gui/e-comp-editor-page-attachments.c	2021-02-23 17:32:18.813227748 -0800
@@ -221,20 +221,15 @@
 {
 	ECompEditor *comp_editor;
 	GtkAction *action;
-	guint32 flags;
-	gboolean is_organizer;
 
 	g_return_if_fail (E_IS_COMP_EDITOR_PAGE_ATTACHMENTS (page));
 
 	E_COMP_EDITOR_PAGE_CLASS (e_comp_editor_page_attachments_parent_class)->sensitize_widgets (page, force_insensitive);
 
 	comp_editor = e_comp_editor_page_ref_editor (page);
-	flags = e_comp_editor_get_flags (comp_editor);
-
-	is_organizer = (flags & (E_COMP_EDITOR_FLAG_IS_NEW | E_COMP_EDITOR_FLAG_ORGANIZER_IS_USER)) != 0;
 
 	action = e_comp_editor_get_action (comp_editor, "attachments-attach");
-	gtk_action_set_sensitive (action, !force_insensitive && is_organizer);
+	gtk_action_set_sensitive (action, !force_insensitive);
 
 	g_clear_object (&comp_editor);
 }
diff -ru evolution-3.38.3/src/calendar/gui/e-comp-editor-page-general.c evolution-3.38.3-patched/src/calendar/gui/e-comp-editor-page-general.c
--- evolution-3.38.3/src/calendar/gui/e-comp-editor-page-general.c	2021-01-08 02:49:31.000000000 -0800
+++ evolution-3.38.3-patched/src/calendar/gui/e-comp-editor-page-general.c	2021-02-23 17:34:13.181799276 -0800
@@ -921,7 +921,7 @@
 	gtk_widget_set_sensitive (page_general->priv->attendees_list_view, !read_only && !force_insensitive);
 
 	action = e_comp_editor_get_action (comp_editor, "option-attendees");
-	gtk_action_set_sensitive (action, !force_insensitive && !read_only && organizer_is_user);
+	gtk_action_set_sensitive (action, !force_insensitive && !read_only);
 
 	if (page_general->priv->comp_color &&
 	    !e_comp_editor_property_part_get_sensitize_handled (page_general->priv->comp_color)) {
diff -ru evolution-3.38.3/src/calendar/gui/e-comp-editor-page-recurrence.c evolution-3.38.3-patched/src/calendar/gui/e-comp-editor-page-recurrence.c
--- evolution-3.38.3/src/calendar/gui/e-comp-editor-page-recurrence.c	2021-01-08 02:49:31.000000000 -0800
+++ evolution-3.38.3-patched/src/calendar/gui/e-comp-editor-page-recurrence.c	2021-02-23 17:35:45.650237443 -0800
@@ -1493,19 +1493,13 @@
 				   gboolean force_insensitive)
 {
 	ECompEditorPageRecurrence *page_recurrence;
-	ECompEditor *comp_editor;
 	GtkTreeSelection *selection;
-	gboolean create_recurrence, any_selected, is_organizer;
-	guint32 flags;
+	gboolean create_recurrence, any_selected;
 
 	g_return_if_fail (E_IS_COMP_EDITOR_PAGE_RECURRENCE (page));
 
 	E_COMP_EDITOR_PAGE_CLASS (e_comp_editor_page_recurrence_parent_class)->sensitize_widgets (page, force_insensitive);
 
-	comp_editor = e_comp_editor_page_ref_editor (page);
-	flags = e_comp_editor_get_flags (comp_editor);
-	g_clear_object (&comp_editor);
-
 	page_recurrence = E_COMP_EDITOR_PAGE_RECURRENCE (page);
 
 	selection = gtk_tree_view_get_selection (GTK_TREE_VIEW (page_recurrence->priv->exceptions_tree_view));
@@ -1513,8 +1507,6 @@
 	force_insensitive = force_insensitive || page_recurrence->priv->is_custom;
 	create_recurrence = gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (page_recurrence->priv->recr_check_box));
 	any_selected = gtk_tree_selection_count_selected_rows (selection) > 0;
-	is_organizer = (flags & (E_COMP_EDITOR_FLAG_IS_NEW | E_COMP_EDITOR_FLAG_ORGANIZER_IS_USER)) != 0;
-	force_insensitive = force_insensitive || !is_organizer;
 
 	gtk_widget_set_sensitive (page_recurrence->priv->recr_check_box, !force_insensitive);
 	gtk_widget_set_sensitive (page_recurrence->priv->recr_hbox, !force_insensitive && create_recurrence);
diff -ru evolution-3.38.3/src/calendar/gui/e-comp-editor-task.c evolution-3.38.3-patched/src/calendar/gui/e-comp-editor-task.c
--- evolution-3.38.3/src/calendar/gui/e-comp-editor-task.c	2021-01-08 02:49:31.000000000 -0800
+++ evolution-3.38.3-patched/src/calendar/gui/e-comp-editor-task.c	2021-02-23 17:36:49.542529740 -0800
@@ -517,7 +517,7 @@
 	gtk_widget_set_sensitive (edit_widget, TRUE);
 
 	action = e_comp_editor_get_action (comp_editor, "all-day-task");
-	gtk_action_set_sensitive (action, !force_insensitive && is_organizer);
+	gtk_action_set_sensitive (action, !force_insensitive);
 
 	if (task_editor->priv->insensitive_info_alert)
 		e_alert_response (task_editor->priv->insensitive_info_alert, GTK_RESPONSE_OK);
@@ -532,7 +532,7 @@
 		else if (e_client_is_readonly (E_CLIENT (client)))
 			message = _("Task cannot be edited, because the selected task list is read only");
 		else if (!is_organizer)
-			message = _("Task cannot be fully edited, because you are not the organizer");
+			message = _("Changes made to the task will not be sent to the attendees, because you are not the organizer");
 
 		if (message) {
 			EAlert *alert;