How can I fix a stair to its shape?
I am trying to build an arch roof using stairs and in doing so I need stairs to get a fixed stair shape. Here are some pictures to clarify:
Two stairs together can form a corner stair:

However when the adjoining stair is removed, the corner stair reverts to a single stair shape:

As you can see, the stair isn't fix as a corner stair. How can I do that?
Best Answer
Short answer: it can't be done. With certain mods however, it can possibly be imitated.
The way you are facing determines the direction the stair faces.

If you place two stairs facing different directions (eg, one facing north, one facing east or west) they will form a corner.
When you destroy a block, it will revert to it's original shape.

It also depends on what version of Minecraft you are playing, because corner stairs were released in version 1.4.2. Any version before this will not have this function
Pictures about "How can I fix a stair to its shape?"



How do you fix an old staircase?
In general, start by adding a stair block, then another next to it with the same orientation. Finally, orient yourself 90 degrees to add the third stair which will complete a corner.How do you fix a loose staircase?
As it is currently, to make a stair block into a corner, you have to have another stair block adjacent to it, and if that stair block gets broken, the stair reverts back to the default.DIY Staircase Makeover
More answers regarding how can I fix a stair to its shape?
Answer 2
You can lock the corner blocks into various block states (e.g. inner_left, inner_right, etc...) by tricking the logic as you position blocks. You can do things like this:

In general, start by adding a stair block, then another next to it with the same orientation. Finally, orient yourself 90 degrees to add the third stair which will complete a corner. Next delete the first block you positioned and the corner block should keep its state. It gets tricky to position corners near each other and takes some practice.
I first got this idea from practicing making a hot tub like this:
I'll try to make a video on the techniques.
Answer 3
Yes! It is possible only by copying and pasting a corner stair with world edit, though.
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Max Vakhtbovych, Karolina Grabowska, Max Vakhtbovych, Max Vakhtbovych
