Add option to disable virtual keyboard for TextEdit

Adding support for disabling virtual keyboard on mobile platforms, in
order to make it consistent with LineEdit.

It allows implementing a custom virtual keyboard.

doc/classes/TextEdit.xml

@@ -430,6 +430,9 @@
 		<member name="v_scroll_speed" type="float" setter="set_v_scroll_speed" getter="get_v_scroll_speed" default="80.0">
 			Vertical scroll sensitivity.
 		</member>
+		<member name="virtual_keyboard_enabled" type="bool" setter="set_virtual_keyboard_enabled" getter="is_virtual_keyboard_enabled" default="true">
+			If [code]true[/code], the native virtual keyboard is shown when focused on platforms that support it.
+		</member>
 		<member name="wrap_enabled" type="bool" setter="set_wrap_enabled" getter="is_wrap_enabled" default="false">
 			If [code]true[/code], enables text wrapping when it goes beyond the edge of what is visible.
 		</member>

scene/gui/text_edit.cpp

@@ -1631,7 +1631,7 @@ void TextEdit::_notification(int p_what) {
 				DisplayServer::get_singleton()->window_set_ime_position(get_global_position() + cursor_pos, get_viewport()->get_window_id());
 			}
 
-			if (DisplayServer::get_singleton()->has_feature(DisplayServer::FEATURE_VIRTUAL_KEYBOARD)) {
+			if (DisplayServer::get_singleton()->has_feature(DisplayServer::FEATURE_VIRTUAL_KEYBOARD) && virtual_keyboard_enabled) {
 				DisplayServer::get_singleton()->virtual_keyboard_show(get_text(), get_global_rect(), true);
 			}
 		} break;
@@ -1647,7 +1647,7 @@ void TextEdit::_notification(int p_what) {
 			ime_text = "";
 			ime_selection = Point2();
 
-			if (DisplayServer::get_singleton()->has_feature(DisplayServer::FEATURE_VIRTUAL_KEYBOARD)) {
+			if (DisplayServer::get_singleton()->has_feature(DisplayServer::FEATURE_VIRTUAL_KEYBOARD) && virtual_keyboard_enabled) {
 				DisplayServer::get_singleton()->virtual_keyboard_hide();
 			}
 		} break;
@@ -6693,6 +6693,10 @@ void TextEdit::set_shortcut_keys_enabled(bool p_enabled) {
 	_generate_context_menu();
 }
 
+void TextEdit::set_virtual_keyboard_enabled(bool p_enable) {
+	virtual_keyboard_enabled = p_enable;
+}
+
 void TextEdit::set_selecting_enabled(bool p_enabled) {
 	selecting_enabled = p_enabled;
 
@@ -6711,6 +6715,10 @@ bool TextEdit::is_shortcut_keys_enabled() const {
 	return shortcut_keys_enabled;
 }
 
+bool TextEdit::is_virtual_keyboard_enabled() const {
+	return virtual_keyboard_enabled;
+}
+
 PopupMenu *TextEdit::get_menu() const {
 	return menu;
 }
@@ -6763,6 +6771,8 @@ void TextEdit::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("is_context_menu_enabled"), &TextEdit::is_context_menu_enabled);
 	ClassDB::bind_method(D_METHOD("set_shortcut_keys_enabled", "enable"), &TextEdit::set_shortcut_keys_enabled);
 	ClassDB::bind_method(D_METHOD("is_shortcut_keys_enabled"), &TextEdit::is_shortcut_keys_enabled);
+	ClassDB::bind_method(D_METHOD("set_virtual_keyboard_enabled", "enable"), &TextEdit::set_virtual_keyboard_enabled);
+	ClassDB::bind_method(D_METHOD("is_virtual_keyboard_enabled"), &TextEdit::is_virtual_keyboard_enabled);
 	ClassDB::bind_method(D_METHOD("set_selecting_enabled", "enable"), &TextEdit::set_selecting_enabled);
 	ClassDB::bind_method(D_METHOD("is_selecting_enabled"), &TextEdit::is_selecting_enabled);
 
@@ -6854,6 +6864,7 @@ void TextEdit::_bind_methods() {
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "override_selected_font_color"), "set_override_selected_font_color", "is_overriding_selected_font_color");
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "context_menu_enabled"), "set_context_menu_enabled", "is_context_menu_enabled");
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "shortcut_keys_enabled"), "set_shortcut_keys_enabled", "is_shortcut_keys_enabled");
+	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "virtual_keyboard_enabled"), "set_virtual_keyboard_enabled", "is_virtual_keyboard_enabled");
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "selecting_enabled"), "set_selecting_enabled", "is_selecting_enabled");
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "smooth_scrolling"), "set_smooth_scroll_enable", "is_smooth_scroll_enabled");
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "v_scroll_speed"), "set_v_scroll_speed", "get_v_scroll_speed");

scene/gui/text_edit.h

@@ -386,6 +386,8 @@ private:
 	bool context_menu_enabled;
 	bool shortcut_keys_enabled;
 
+	bool virtual_keyboard_enabled = true;
+
 	int executing_line;
 
 	void _generate_context_menu();
@@ -749,6 +751,9 @@ public:
 	void set_shortcut_keys_enabled(bool p_enabled);
 	bool is_shortcut_keys_enabled() const;
 
+	void set_virtual_keyboard_enabled(bool p_enable);
+	bool is_virtual_keyboard_enabled() const;
+
 	PopupMenu *get_menu() const;
 
 	String get_text_for_completion();