Opera & Safari- It's not possible to enter text after Horizontal Line & Page break

[Satya Minnekanti]

To reproduce the defect:

1. Open CK Editor, Type some text.

2. Click on Insert Horizontal Line icon.

Expected Result:

Horizontal line is inserted after the current paragraph and cursor is positioned after the Horizontal line.

Actual Result:

In Safari Horizontal line is inserted after the current paragraph but cursor is missing from editor even when we try to position the cursor after Horizontal Line it's not possible.

In Opera Horizontal line is inserted after the current paragraph but cursor is positioned at the end of paragraph before Horizontal Line even when we try to position the cursor after Horizontal Line it's not possible.

Same issue happening with Page break

[Garry Yao]

DUP of #6554, please search for existing tickets before a bug report.