Use stable sort for table's sort

[jeff-a-andersen]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

When sorting a column, other column data should not sort.

What is the current behavior?

If there are more than 10 rows, other column data is randomly sorted

What are the steps to reproduce?

I was able to reproduce the problem by taking the example from Material (https://stackblitz.com/angular/ygkamyrvqvr?file=app%2Ftable-sorting-example.ts):

1. Change the position value to be all “1”:

2. Now, if I sort on the “No.” column, the “Name” column stays exactly the same (as you would expect because you aren’t sorting on it):

3. Now, if we add an 11th row:

4. And then sort on the “No.” column, the “Name” column is randomly sorting:

What is the use-case or motivation for changing an existing behavior?

I believe this to be incorrect behaviour

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

"@angular/material": "^6.4.7",
"@angular/cli": "~6.1.5",
"@angular/compiler-cli": "^6.1.0",
"typescript": "~2.7.2"

OS: Windows 10 Version 1703 (OS Build 15063.1324)
Browser: Chrome Version 69.0.3497.92 (Official Build) (64-bit)

Is there anything else we should know?

[jelbourn]

What you're requesting is a stable sort

[jeff-a-andersen]

What is strange is that appears to be stable up to 10 rows of data and then it becomes unstable after that. Perhaps it's using a different sort algorithm when there are more than 10 rows.

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