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|Previous Edit menu item to move the text cursor to the line further up 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 first line. If the cursor is already on such a line, then Go|Previous Edit skips over all such adjacent lines, moving the cursor to the previous edited line after the previous unedited line. Basically, it jumps from one block of edited lines to the last line in the previous block of edited lines.
Go menu
Go|Next Edit
Go|Next Unsaved Edit
Go|Previous Unsaved Edit
Editor Preferences