Problem:
Spacemacs rewrites the evil-mc-mode-line variable, to remove the evil-mc mode
line text, when there's only one cursor. The rewrite blocks the recent evil-mc
updates, that made the multi cursor, mode line text, more readable.
Solution:
Use the new evil-mc-one-cursor-show-mode-line-text variable, to only hide the
mode line text, when there's one cursor. This unblocks the current, and any
future updates, that the evil-mc package makes to the mode line text.
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