Building cancellation

[Dangleos]

Describe the content or mechanics you are proposing.

When a place where you want to build was occupied by a unit at a moment of placing schematic or a unit walked at this place right when you tried to build there a block the building process should resume when that unit walks out of the way

Describe how you think this content will improve the game. If you're proposing new content, mention how it may add more gameplay options or how it will fill a new niche.

Ground units cancelling building plans are annoying

Before making this issue, check the boxes below to confirm that you have acknowledged them.

• [X] I have checked the Trello to make sure my suggestion isn't planned or implemented in a development version.
• [X] I am familiar with all the content already in the game or have glanced at the wiki to make sure my suggestion doesn't exist in the game yet.
• [X] I have read README.md to make sure my idea is not listed under the "A few things you shouldn't suggest" category.