Fix undefined drop-cap class

[swissspidy]

Right now when adding a new text block, it gets a drop-cap-undefined class because dropCap is not defined in the block (instead of drop-cap-false I guess). If the drop cap toggle is turned on, there will be a drop-cap-true class.

It makes more sense to only add a drop-cap class if it's enabled and don't do anything else otherwise. You can target non-drop-cap blocks using the :not() CSS selector already.

Plus, drop-cap is more readable than drop-cap-false and drop-cap-true.

[youknowriad]

Should this sync with the "drop cap" updates in #1418?

[swissspidy]

The drop cap changes in #1418 don't touch the same lines as this PR does.

If I rename the class to has-drop-cap in this PR, it could simply go in before the other (which seems to be still in the works).

[mtias]

Yes, let's update to has-drop-cap. Thanks for fixing.

[youknowriad]

👍 Ship it