Add get_text_info() in TileSetCustom

Translations/Translations.pot

@@ -2239,6 +2239,10 @@ msgstr ""
 msgid "Group"
 msgstr ""
 
+#. A tilemap is a type of layer, which is divided by grid cells, the size of which is determined by the tileset it uses. Each grid cell is mapped to a tile in the tileset. Tilemaps can be used to create game levels and layouts.
+msgid "Tilemap"
+msgstr ""
+
 msgid "Layers"
 msgstr ""
 
@@ -3381,6 +3385,7 @@ msgid "Do you want to download the image from %s?"
 msgstr ""
 
 #. A tileset is a collection of tiles.
+#: src/Classes/TileSetCustom.gd
 #: src/UI/Dialogs/ImportPreviewDialog.gd
 msgid "Tileset"
 msgstr ""

src/Classes/TileSetCustom.gd

@@ -127,6 +127,15 @@ func clear_tileset(cel: CelTileMap) -> void:
 	set_deferred("_tileset_has_been_cleared", false)
 
 
+## Returns the tilemap's info, such as its name and tile size and with a given
+## [param tile_index], in the form of text.
+func get_text_info(tile_index: int) -> String:
+	var item_string := " %s (%s×%s)" % [tile_index, tile_size.x, tile_size.y]
+	if not name.is_empty():
+		item_string += ": " + name
+	return tr("Tileset") + item_string
+
+
 ## Serializes the data of this class into the form of a [Dictionary],
 ## which is used so the data can be stored in pxo files.
 func serialize() -> Dictionary:

src/UI/Timeline/NewTileMapLayerDialog.gd

@@ -33,10 +33,7 @@ func _on_about_to_popup() -> void:
 	tileset_option_button.add_item("New tileset")
 	for i in project.tilesets.size():
 		var tileset := project.tilesets[i]
-		var item_string := " %s (%s×%s)" % [i, tileset.tile_size.x, tileset.tile_size.y]
-		if not tileset.name.is_empty():
-			item_string += ": " + tileset.name
-		tileset_option_button.add_item(tr("Tileset" + item_string))
+		tileset_option_button.add_item(tileset.get_text_info(i))
 	_on_tileset_option_button_item_selected(tileset_option_button.selected)