Changing the delimiter doesn't always trigger auto-detect labels

USE CASE: WHAT DO YOU WANT TO DO?

When the delimiter is changed, the auto-detect labels should run.

STEPS TO REPRODUCE AN ISSUE (OR TRIGGER A NEW FEATURE)

Open small_133x133.txt in a text editor and replace all tab characters with semicolons (The crucial portion about this step is that it is now a new file that treeview has never opened before)
Open the file in treeview
Select semicolon as the delimiter and deselect tab

CURRENT BEHAVIOR

If the file is one that you've never opened before and it uses a delimiter other than tab, selecting a different delimiter does not automatically trigger the "auto-detect labels" feature.

EXPECTED BEHAVIOR

Autoupdate labels is triggered when the delimiters selected changes.

DEVELOPERS ONLY SECTION

SUGGESTED CHANGE (Pseudocode optional)

none

FILES AFFECTED (where the changes will be implemented) - developers only

unknown

LEVEL OF EFFORT - developers only

minor

COMMENTS

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