Nudges in the same direction should be combined in history

Any number of nudges (with the arrow key) in the same direction should be combined into the same history step. So if you nudge 53px to the right with Shift+right arrow 5 times and right arrow 3 times, we should be able to use undo one instead of 8 times to return to where we were. Then switching directions (or doing anything else that creates a history step) should become a new point in history.

No file, test, or entry point is named. Start by locating the arrow-key nudge handling and the history or undo implementation, then verify that consecutive nudges in one direction—including mixed Shift and unmodified nudges—undo as one step, while a direction change or other history-producing action starts a new step.

Scritto dal modello di indicizzazione a partire dal testo della issue.