Hopefully I have an update regarding this bug...
It's about of
how do you select the text, actually.
Like to show on an exact example, copy this text into the message field:
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
Then try the following:
— select/highlight some text
with the mouse, let's say the 3rd to the 5th word i.e.
dolor sit amet— delete it clicking Del button
— select/highlight some other text, let's say
consectetur adipiscing elit,
BUT NOT WITH THE MOUSE — for example, putting the cursor at the beginning of the phrase and then, holding Shift button, scroll the selection with the Right-Arrow button, or otherwise — put the cursor at the end of the phrase, and then scroll the selection with the Left-Arrow button
— click the Bold button
— you should see that between [b ] ... [ /b] tags, the deleted phrase
dolor sit amet will appear.
I need more reports on it... if it's confirmed with such an algorithm, then it just means the current function doesn't catch any other highlighting/selecion other than if the mouse is used, and that's what the bug is about.