[28] Fixes container width and height values causing layout issues when changing theme or updating settings.layout.contentSize value in theme.json

[PaulREnglish]

Description

Issue: #28.

Assigns the Image Comparisons containerHeight and containerWidth values a default of null. This is to avoid an issue where the block won't scale to the new width if the settings.layout.contentSize setting in theme.json is changed and the user has not set a width yet.

Change Log

• Fixes an issue where containerHeight and containerWidth values not specifically set the by user would not scale when the settings.layout.contentSize setting in theme.json would change.

Steps to test

1. Add an Image Comparison block
2. Add both images
3. Save
4. Increase the settings.layout.contentSize value in theme.json
5. Refresh page
6. See that the Image Comparison block is now displaying correctly in the editor and on the frontend

Screenshots/Videos

http://bigbite.im/v/KfN5NC

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

[PaulREnglish]

Converting to draft as there is a few changes I need to implement to make some of the other tickets mentioned in #32 a bit easier.

[chrishbite]

Closed as superseded by #39