Don't duplicate @-filenames when pressing tab if the whole string has been typed #2218
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This code was using
input.lastIndexOf(fileDisplayText)
to find the location of the text to compute the suffix, but it didn't take into account the length, so any time input contained fileDisplayText, the contents of fileDisplayText would become duplicated.(@abeatrix the original code was added as part of a fix for #1973 - in my testing that still seems to work correctly with my change, but let me know if I've misunderstood).
Fixes #2200
Test plan
pnpm test:unit at-file
or<tab>
to accept the file