Lists are all bold if item has space

[paul-test]

Bug description

My data is 12 hours time, e.g.
12:00 AM
12:15 AM
12:30 AM
......
If I select 12:15 PM and then open the dropdown dialog, all AM of each item are all bold.

Expected result

The font should be normal

Actual result

12:00 AM
12:15 AM
12:30 AM

Steps to reproduce

1. Set the datasource as string[] and push strings like '12:00 AM', '12:15 AM', '12:30 AM'.
2. Select 12:15 AM
3. Click the input and then the list pops up. All 'AM' are bold.

Context

It should be a problem of HighlightPipe.

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