Calm

Thank you for your reply. I've uploaded two GIF files, which can explain the problems I'm facing. Can you check them?  

If I move the cursor to another window and then move it back, the `:w` instruction can remove the space.

If you need more information, please let me know. I'm afraid I didn't describe the problem clearly. Thanks

Thank you for your reply, which makes me learn a lot. ^_^

I have a similar problem, this [ always appears in front of my first undeployed folder Icon.