Your comments
In your case I recommend to use a tool that simply fixes all line separators. This is, IMHO, not the task of a version control client.
The 17.1 preview intermediate build 11081 (Help | Check for Latest Build) let's you play with that feature. You can active it from the Changes menu, the option is named "Compact Changes Display".
Just click the Amend checkbox 1 or 2 times.
The color can be changed with the line
graph.merge.text=#808080
- at least in 17.1 preview.
When starting the interactive rebase from the Journal, the log should remain operational.
The reason is simple: the normal Journal just rejects the operation if there is a conflict.
It is also possible to open the log before starting the interactive rebase.
This is no general interactive rebase problem but one with your particular repository - most likely you have committed line separator changes unintentionally. Again, userecho is NO support forum.
What do you mean with "it doesn't work the same way as the Journal"?
Customer support service by UserEcho
The compact view option only is available for read-only Changes views. The File Compare is designed to be freely editable.