Add option to show only the unique prefix of tab names
When the set of tabs used fluctuate, the memory of which number belongs to which chat becomes difficult to work with. Non-numbers can be used to navigate tabs with `/win`, however, it is difficult to know which letters are required to select a certain tab. This option introduces a display mode for tab names where only the unique prefix of the tab name is shown, saving space and providing with a minimal string which can be used with `/win`.
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