xC/xF: make it possible to insert newlines directly

That should do for us to stop claiming that the interface needs polish.

README.adoc

@@ -11,9 +11,7 @@ They're all lean on dependencies, and offer a maximally permissive licence.
 xC
 --
 The IRC client, and the core of 'xK'.  Its interface should feel somewhat
-familiar for WeeChat or irssi users.  Currently the terminal interface
-experience deserves some polishing, because we've just got rid of
-Readline/Editline dependencies, which kept breaking in exciting ways.
+familiar for WeeChat or irssi users.
 
 image::xC.webp[align="center"]
 

xC.c

@@ -14442,6 +14442,15 @@ on_insert_attribute (int key, void *user_data)
 	return true;
 }
 
+static bool
+on_insert_newline (int key, void *user_data)
+{
+	(void) key;
+
+	struct app_context *ctx = user_data;
+	return input_insert (ctx->input, "\n");
+}
+
 #define BRACKETED_PASTE_LIMIT 102400    ///< How much text can be pasted
 
 static bool
@@ -14636,6 +14645,7 @@ app_input_init (struct input *self)
 	XX ("edit-input",         "Edit input",        on_edit_input)
 	XX ("redraw-screen",      "Redraw screen",     on_redraw_screen)
 	XX ("insert-attribute",   "IRC formatting",    on_insert_attribute)
+	XX ("insert-newline",     "Insert newline",    on_insert_newline)
 	XX ("start-paste-mode",   "Bracketed paste",   on_start_paste_mode)
 	XX ("accept-line",        "Send line",         on_input_return)
 	XX ("complete",           "Complete word",     on_input_complete)
@@ -14656,6 +14666,7 @@ app_input_init (struct input *self)
 	input_bind (self, "M-a",     "goto-activity");
 	input_bind (self, "M-A",     "goto-backtivity");
 	input_bind (self, "M-m",     "insert-attribute");
+	input_bind (self, "M-Enter", "insert-newline");
 	input_bind (self, "M-h",     "display-full-log");
 	input_bind (self, "M-H",     "toggle-unimportant");
 	input_bind (self, "M-e",     "edit-input");

xF.c

@@ -278,6 +278,7 @@ enum action
 	ACTION_EDIT_INPUT,
 	ACTION_VIEW_TRANSCRIPT,
 	ACTION_OPEN,
+	ACTION_INSERT_NEWLINE,
 	ACTION_FORMAT,
 	ACTION_FORMAT_BOLD,
 	ACTION_FORMAT_ITALIC,
@@ -3980,6 +3981,9 @@ app_process_action (enum action action)
 		return app_launch_transcript_editor ();
 	case ACTION_OPEN:
 		return app_open_last_link ();
+	case ACTION_INSERT_NEWLINE:
+		app_editor_insert ('\n');
+		return true;
 	case ACTION_FORMAT:
 		g.inserting_attribute = true;
 		return true;
@@ -4155,6 +4159,7 @@ g_default_bindings[] =
 	{ "M-e",        ACTION_EDIT_INPUT                },  // xC
 	{ "M-E",        ACTION_VIEW_TRANSCRIPT           },  // xF
 	{ "C-o",        ACTION_OPEN                      },  // xF
+	{ "M-Enter",    ACTION_INSERT_NEWLINE            },
 	{ "M-m",        ACTION_FORMAT                    },  // xC
 	{ "PageUp",     ACTION_SCROLL_UP                 },
 	{ "PageDown",   ACTION_SCROLL_DOWN               },