Displaying the string on hover has no limits for characters and it is not defined properly how the string should be formatted/centered, respectively aligned within the text box.

At least the following issues are reproducible, if not more:

• During hovering over label, if the string contains a space as the last character, the text "box" is bigger than expected:
  • Example: "123456789012345678901234567890123 "

• If the long string contain spaces, the text box is smaller than expected:
  • Example: "123456789012345678901234567890123 123456789"

• If text is too long, the rendering in the diagram is taking too much time, or it is not being rendered at all. There should be set the maximum amount of characters to display to avoid performance issues.