fix: prevent error when minimap squashed

[aminya]

Fix error when the middle pane is 0 width

Fixes atom-community#15
Fixes #702

Originally posted at atom-community#13 (comment) by @UziTech

[aminya]

This does not fix the issue yet.

[aminya]

Are these canvas.width and offscreenCanvas.width values calculated on the fly or they are cached/constant?

[UziTech]

I believe they are calculated

[aminya]

Could you benchmark the call to them?

let t1 = window.performance.now()

// call to these

console.log(window.performance.now() - t1)

[UziTech]

I got .07 with the if and .09 without lol so it must be constant

let t1 = window.performance.now()
layer.copyPartFromOffscreen(50, 100, 150)
console.log(window.performance.now() - t1)

[aminya]

Sounds good. I will test this tomorrow if I find some time.

[github-actions]

🎉 This PR is included in version 4.31.1 🎉

The release is available on:

• GitHub release
• Atom package

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