I’ve noticed that when using Composer, Cursor sometimes struggles to merge new code changes into a file, often getting confused and inadvertently wiping out significant blocks of code that it shouldn’t.
In fact, this seems to be the most common way Cursor can seriously disrupt your codebase.
To address this, I try to monitor every change it makes to ensure it stays on track. However, there are times when I’m tired or in a rush, and I end up clicking the “Accept” button more recklessly, without thoroughly checking the work. At a minimum, I’ve found it helpful to quickly scroll through the file to look for any large blocks of code being removed, as this is usually a red flag that the model may be struggling with the merge.
One fairly reliable way I’ve found to resolve these types of merge failures is to reject the change and then follow up by asking the model to:
Review @filename and provide me with an updated version of the file in its entirety, incorporating your latest changes.
Nine times out of ten, requesting the file in its entirety helps bypass the merge issue and applies the changes as intended.