[QA] Edit inline shape plus delete key

[brauliodiez]

Scope of the tests

If I drag an input component and double-click to change the placeholder text, type "user," press the delete key to remove the last letter, leaving "use," and then press Enter, the input component should display "use" as the placeholder text.

Preconditions:

• Navigate to the mock design page (localhost environment).
• Components gallery must be present.
• The canvas area must be ready for interaction

Test steps (video, request access if you are going to work on this case), automate this:

Manual steps (video, request access if you are going to work on this case), automate this:

https://drive.google.com/open?id=1IVdczoi_dwv_yYJosY3CVbsU97TR0_X0&usp=drive_fs

Expected result

• Input with placeholder text "use"