On the Editor page in the Preferences you can turn on an option to “indicate lines that were edited since the file was last opened or saved with highlighting in the left margin”. When this is on, you can use the Go|Next Edit menu item to move the text cursor to the line further down in the file that is indicated as having been edited since the file was last opened or saved. If there is no such line, the cursor is moved to the last line. If the cursor is already on such a line, then Go|Next Edit skips over all such adjacent lines, moving the cursor to the next edited line after the next unedited line. Basically, it jumps from one block of edited lines to the first line in the next block of edited lines.
Go|Next Unsaved Edit
Go|Previous Unsaved Edit