3 fixes

[fredcw]

I'm not sure if these might get overlooked before the end of beta so I thought I'd make a note of them here just in case as they're fairly important. Please close this issue if that's not the case.

linuxmint/cinnamon#13277

linuxmint/cinnamon#13297

linuxmint/cinnamon#13303

There's also two minor cosmetic issues in Mint-Y & Mint-L themes:

linuxmint/mint-themes#527

linuxmint/mint-l-theme#21

[fredcw]

All merged, thanks.