Empty lines inside text in frames do not resize properly when changing font size

[p-mitana]

Issue type

UI bug

Bug description

When text in frame that contains empty lines and user changes the font size for it, the change is not applied to empty lines. Instead, only the lines that contain text are resized. Sometimes empty lines will update when I click outside of the frame (i think that when there is only one empty line in a row), but it behaves a bit weirdly.

Steps to reproduce

1. Add a frame
2. Add text to this frame with two lines of text separated by an empty line or two, for example:

Some text
(empty line)
(empty line)
Some more text

3. Select all the text in the frame
4. Change size to some big value for contrast
5. Try changing size back and forth and notice how it behaves

You can also create an additional text for verse numbering:

1. Write verses:

This
is
first
verse
(empty line)
This
is
second
verse

2. Move the text a bit to the right
3. Add another text to the frame
4. Write the numbers:

(empty line)
(empty line)
(empty line)
(empty line)
2.

5. Numbers should be aligned to verses at this point. Now try to change the font size for both frames to the same value and see what happens.

Screenshots/Screen recordings

No response

MuseScore Version

OS: Fedora Linux 38 (Workstation Edition), Arch.: x86_64, MuseScore version (64-bit): 4.1.1-232071203, revision: github-musescore-musescore-e4d1ddf

Regression

No.

Operating system

Fedora Linux 38

Additional context

Official AppImage distribution

[Thomas-Ganter]

Is this a proper illustration of the issue:

This ...

... turns into this when changing font size to 50 ...

BTW:
This is what the file looks like after Save / Close / Reopen:

This version has even LOST the two empty lines altogether.

I wager the expected look is this, both after resize and after close/ reopen:

I'm happy to give this a shot, can someone assign me please?
After all I just fixed formatting issues and empty lines in headers/ footers

[cbjeukendrup]

This is what the file looks like after Save / Close / Reopen:

For empty lines between formatted pieces of text being lost: #28522

But if you want to work on the empty line height resize issue, that's certainly appreciated!