split view causes trailing space fixes to stop working

[prabashn]

If you open the same file more than once in split view, the plugin seems to stop working.

repro steps:

1. open a TS file (for example)
2. open the same file in #1 using split view mode
3. introduce a trailing space in the code
4. save the file (making sure "fix on save" setting is enabled)

expected: The trailing space on the file should be fixed, and should reflect on both split view panes.

actual: the trailing space remains even after the save.

[mhsmith]

Split view only affects the "trim on save" feature – running the trim command manually still works.