Text in WYSIWYG Email Content editor disappears after switching Content type

[konyashkina]

(After testing Email sending model element #6 )

BPM Send Email Task in Modeler:
All typed text in WYSIWYG Email Content editor disappears after switching Content type from HTML to Text and vise versa.
It can be really annoying for users.

Tested on
Jmix version: 1.1.0-SNAPSHOT
Jmix Studio plugin version: 1.1.SNAPSHOT3528-212
IntelliJ version: IntelliJ IDEA 2021.2.1 (Ultimate Edition)

Pre-conditions: BPM and Email addons are installed.

Case 1

Steps to reproduce:

1. Run Jmix application and open Modeler to edit BPM process.
2. Create 1 task with type = Send Email Task.
3. Go to Details > Content type. Click an icon on the right
   
   to start edit Content.
4. ('Email Content edit' WYSIWYG window appears. Content type is HTML by default). Type some letters there.
5. Change Content type to Text.

Expected result:
Content type is Text and the content already typed by user is shown as text below.

Actual result:
Content type is Text, but all typed text disappears from this field.

Case 2

Steps:

1. Set Content type as Text in the 'Email Content edit' WYSIWYG window and type some letters there.
2. Change Content type to HTML.

Expected result:
Content type is HTML and the content already typed by user is shown as text below.

Actual result:
Content type is HTML, but all typed text disappears from this field.

[gorbunkov]

We will not implement the HTML <-> Plain text conversion, it's not an easy task and it's not worth doing it here. Instead we may add a confirmation dialog that says that the content will be cleared. The dialog will appear when the user changes the content-type

[konyashkina]

Tested on
Jmix version: 1.1.0-SNAPSHOT
Jmix Studio plugin version: 1.1.SNAPSHOT3575-212
IntelliJ version: IntelliJ IDEA 2021.2.2 (Community Edition)

Case 1.
HTML -> Plain text conversion
A confirmation dialog appears and says that the content will be cleared:

Case 2.
Plain text -> HTML conversion
Works fine.