Steps to Reproduce:

1. Create a Page
2. Write a text with one word strikethrough
3. Link the text

Expected Results:

All the text must be linked

Actual Results:

Word after strikethrough is not linked

Screencast

http://screencast.com/t/G3aUVMlYTn1

Workaround:

1. Create/Edit a Page
2. Click on Insert
3. Choose Wiki Markup
4. If you want to create "Good Day Atlassian" you can use "-" to create Strike Through between words. Following is a demonstration of how to create a strike through between words:

    Good -Day- Atlassian 

5. Click on Insert
6. Now you can highlight your text and click on Link (Ctrl + K) to create link on that text