xF: support pasting from clipboard

Bump liberty.  Most of the change happens in liberty-xui.

xF.c

@@ -279,6 +279,7 @@ enum action
 	ACTION_VIEW_TRANSCRIPT,
 	ACTION_OPEN,
 	ACTION_INSERT_NEWLINE,
+	ACTION_PASTE,
 	ACTION_FORMAT,
 	ACTION_FORMAT_BOLD,
 	ACTION_FORMAT_ITALIC,
@@ -2282,6 +2283,20 @@ app_on_clipboard_copy (const char *text)
 	print_status ("copied to clipboard: %s", text);
 }
 
+static void
+app_on_clipboard_paste (const char *text)
+{
+	if (!text)
+		return;
+
+	struct utf8_iter iter = utf8_iter_make (text);
+	int32_t codepoint = 0;
+	size_t codepoint_len = 0;
+	while ((codepoint = utf8_iter_next (&iter, &codepoint_len)) >= 0)
+		app_editor_insert (codepoint);
+	xui_invalidate ();
+}
+
 static void
 app_select_backend (void)
 {
@@ -3984,6 +3999,11 @@ app_process_action (enum action action)
 	case ACTION_INSERT_NEWLINE:
 		app_editor_insert ('\n');
 		return true;
+	case ACTION_PASTE:
+		if (!g_xui.ui->request_clipboard)
+			return false;
+		g_xui.ui->request_clipboard ();
+		return true;
 	case ACTION_FORMAT:
 		g.inserting_attribute = true;
 		return true;
@@ -4160,6 +4180,8 @@ g_default_bindings[] =
 	{ "M-E",        ACTION_VIEW_TRANSCRIPT           },  // xF
 	{ "C-o",        ACTION_OPEN                      },  // xF
 	{ "M-Enter",    ACTION_INSERT_NEWLINE            },
+	{ "C-v",        ACTION_PASTE                     },
+	{ "S-Insert",   ACTION_PASTE                     },
 	{ "M-m",        ACTION_FORMAT                    },  // xC
 	{ "PageUp",     ACTION_SCROLL_UP                 },
 	{ "PageDown",   ACTION_SCROLL_DOWN               },