Clear format does not work

[dannylg]

When I create a heading text and then add a paragraph, it inherits the heading style and the option to clear formatting it is not removed. even, if I paste the text with another external format and clean the style, it becomes heading text

[nguyentanphu]

Same issue, heading definitely not removing when clicking on clear format. Can you take a look @chmln ,please?

[nguyentanphu]

I have created a pull request. If you have sometime, please take a look @chmln
#136

[ZachitZo]

forcePlainTextOnPaste: true - does not work, don't clear styles automatically for pasted text...
Button "clear" on toolbar do it, but option "forcePlainTextOnPaste" - not...