Disable macOS native tabs (introduced in 10.12) #788
Merged
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MacVim already has its own tabbing interface and native tabs (configurable in System Preferences) introduce a second layer of tabs which is confusing. MacVim also doesn't behave properly under such circumstances such as rendering artifacts, lacking proper native menu items (e.g. "Move Tab to New Window"), and keyboard shortcuts like Cmd-W don't work.
Note that it's currently not a good idea to implement Vim tabs using native tabs since they assume multiple NSWindow instances and assume they can be split off into multiple windows, which Vim doesn't support.