Add auto-wrap mode property to the RichTextLabel, set default auto-wrap mode to AUTOWRAP_WORD_SMART to match 3.x behavior.

doc/classes/RichTextLabel.xml

@@ -372,6 +372,9 @@
 		</method>
 	</methods>
 	<members>
+		<member name="autowrap_mode" type="int" setter="set_autowrap_mode" getter="get_autowrap_mode" enum="RichTextLabel.AutowrapMode" default="3">
+			If set to something other than [constant AUTOWRAP_OFF], the text gets wrapped inside the node's bounding rectangle. To see how each mode behaves, see [enum AutowrapMode].
+		</member>
 		<member name="bbcode_enabled" type="bool" setter="set_use_bbcode" getter="is_using_bbcode" default="false">
 			If [code]true[/code], the label uses BBCode formatting.
 		</member>
@@ -454,6 +457,18 @@
 		</signal>
 	</signals>
 	<constants>
+		<constant name="AUTOWRAP_OFF" value="0" enum="AutowrapMode">
+			Autowrap is disabled.
+		</constant>
+		<constant name="AUTOWRAP_ARBITRARY" value="1" enum="AutowrapMode">
+			Wraps the text inside the node's bounding rectangle by allowing to break lines at arbitrary positions, which is useful when very limited space is available.
+		</constant>
+		<constant name="AUTOWRAP_WORD" value="2" enum="AutowrapMode">
+			Wraps the text inside the node's bounding rectangle by soft-breaking between words.
+		</constant>
+		<constant name="AUTOWRAP_WORD_SMART" value="3" enum="AutowrapMode">
+			Behaves similarly to [constant AUTOWRAP_WORD], but force-breaks a word if that single word does not fit in one line.
+		</constant>
 		<constant name="LIST_NUMBERS" value="0" enum="ListType">
 			Each list item has a number marker.
 		</constant>

scene/gui/rich_text_label.cpp

@@ -421,9 +421,24 @@ void RichTextLabel::_shape_line(ItemFrame *p_frame, int p_line, const Ref<Font>
 
 	Line &l = p_frame->lines.write[p_line];
 
+	uint16_t autowrap_flags = TextServer::BREAK_MANDATORY;
+	switch (autowrap_mode) {
+		case AUTOWRAP_WORD_SMART:
+			autowrap_flags = TextServer::BREAK_WORD_BOUND_ADAPTIVE | TextServer::BREAK_MANDATORY;
+			break;
+		case AUTOWRAP_WORD:
+			autowrap_flags = TextServer::BREAK_WORD_BOUND | TextServer::BREAK_MANDATORY;
+			break;
+		case AUTOWRAP_ARBITRARY:
+			autowrap_flags = TextServer::BREAK_GRAPHEME_BOUND | TextServer::BREAK_MANDATORY;
+			break;
+		case AUTOWRAP_OFF:
+			break;
+	}
+
 	// Clear cache.
 	l.text_buf->clear();
-	l.text_buf->set_flags(TextServer::BREAK_MANDATORY | TextServer::BREAK_WORD_BOUND | TextServer::JUSTIFICATION_KASHIDA | TextServer::JUSTIFICATION_WORD_BOUND | TextServer::JUSTIFICATION_TRIM_EDGE_SPACES);
+	l.text_buf->set_flags(autowrap_flags | TextServer::JUSTIFICATION_KASHIDA | TextServer::JUSTIFICATION_WORD_BOUND | TextServer::JUSTIFICATION_TRIM_EDGE_SPACES);
 	l.char_offset = *r_char_offset;
 	l.char_count = 0;
 
@@ -4077,6 +4092,19 @@ String RichTextLabel::get_language() const {
 	return language;
 }
 
+void RichTextLabel::set_autowrap_mode(RichTextLabel::AutowrapMode p_mode) {
+	if (autowrap_mode != p_mode) {
+		autowrap_mode = p_mode;
+		main->first_invalid_line = 0; //invalidate ALL
+		_validate_line_caches(main);
+		update();
+	}
+}
+
+RichTextLabel::AutowrapMode RichTextLabel::get_autowrap_mode() const {
+	return autowrap_mode;
+}
+
 void RichTextLabel::set_percent_visible(float p_percent) {
 	if (percent_visible != p_percent) {
 		if (p_percent < 0 || p_percent >= 1) {
@@ -4188,6 +4216,9 @@ void RichTextLabel::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("set_language", "language"), &RichTextLabel::set_language);
 	ClassDB::bind_method(D_METHOD("get_language"), &RichTextLabel::get_language);
 
+	ClassDB::bind_method(D_METHOD("set_autowrap_mode", "autowrap_mode"), &RichTextLabel::set_autowrap_mode);
+	ClassDB::bind_method(D_METHOD("get_autowrap_mode"), &RichTextLabel::get_autowrap_mode);
+
 	ClassDB::bind_method(D_METHOD("set_meta_underline", "enable"), &RichTextLabel::set_meta_underline);
 	ClassDB::bind_method(D_METHOD("is_meta_underlined"), &RichTextLabel::is_meta_underlined);
 
@@ -4280,6 +4311,8 @@ void RichTextLabel::_bind_methods() {
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "text_direction", PROPERTY_HINT_ENUM, "Auto,Left-to-Right,Right-to-Left,Inherited"), "set_text_direction", "get_text_direction");
 	ADD_PROPERTY(PropertyInfo(Variant::STRING, "language", PROPERTY_HINT_LOCALE_ID, ""), "set_language", "get_language");
 
+	ADD_PROPERTY(PropertyInfo(Variant::INT, "autowrap_mode", PROPERTY_HINT_ENUM, "Off,Arbitrary,Word,Word (Smart)"), "set_autowrap_mode", "get_autowrap_mode");
+
 	ADD_GROUP("Structured Text", "structured_text_");
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "structured_text_bidi_override", PROPERTY_HINT_ENUM, "Default,URI,File,Email,List,None,Custom"), "set_structured_text_bidi_override", "get_structured_text_bidi_override");
 	ADD_PROPERTY(PropertyInfo(Variant::ARRAY, "structured_text_bidi_override_options"), "set_structured_text_bidi_override_options", "get_structured_text_bidi_override_options");
@@ -4288,6 +4321,11 @@ void RichTextLabel::_bind_methods() {
 	ADD_SIGNAL(MethodInfo("meta_hover_started", PropertyInfo(Variant::NIL, "meta", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NIL_IS_VARIANT)));
 	ADD_SIGNAL(MethodInfo("meta_hover_ended", PropertyInfo(Variant::NIL, "meta", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NIL_IS_VARIANT)));
 
+	BIND_ENUM_CONSTANT(AUTOWRAP_OFF);
+	BIND_ENUM_CONSTANT(AUTOWRAP_ARBITRARY);
+	BIND_ENUM_CONSTANT(AUTOWRAP_WORD);
+	BIND_ENUM_CONSTANT(AUTOWRAP_WORD_SMART);
+
 	BIND_ENUM_CONSTANT(LIST_NUMBERS);
 	BIND_ENUM_CONSTANT(LIST_LETTERS);
 	BIND_ENUM_CONSTANT(LIST_ROMAN);

scene/gui/rich_text_label.h

@@ -39,6 +39,13 @@ class RichTextLabel : public Control {
 	GDCLASS(RichTextLabel, Control);
 
 public:
+	enum AutowrapMode {
+		AUTOWRAP_OFF,
+		AUTOWRAP_ARBITRARY,
+		AUTOWRAP_WORD,
+		AUTOWRAP_WORD_SMART
+	};
+
 	enum ListType {
 		LIST_NUMBERS,
 		LIST_LETTERS,
@@ -346,6 +353,8 @@ private:
 
 	VScrollBar *vscroll = nullptr;
 
+	AutowrapMode autowrap_mode = AUTOWRAP_WORD_SMART;
+
 	bool scroll_visible = false;
 	bool scroll_follow = false;
 	bool scroll_following = false;
@@ -574,6 +583,9 @@ public:
 	void set_language(const String &p_language);
 	String get_language() const;
 
+	void set_autowrap_mode(AutowrapMode p_mode);
+	AutowrapMode get_autowrap_mode() const;
+
 	void set_structured_text_bidi_override(Control::StructuredTextParser p_parser);
 	Control::StructuredTextParser get_structured_text_bidi_override() const;
 
@@ -603,6 +615,7 @@ public:
 	~RichTextLabel();
 };
 
+VARIANT_ENUM_CAST(RichTextLabel::AutowrapMode);
 VARIANT_ENUM_CAST(RichTextLabel::ListType);
 VARIANT_ENUM_CAST(RichTextLabel::ItemType);
 VARIANT_ENUM_CAST(RichTextLabel::VisibleCharactersBehavior);