Make about chat show up as fullscreen on iOS

[ann0see]

Fixes an overflow bug for the about dialog on iOS.

Related to: https://github.com/jamulussoftware/jamulus/pull/3343

Short description of changes

Attempt to show chat dialog as full screen. Doesn't work yet - especially if rotating the screen.

CHANGELOG: CONDENSE WITH https://github.com/jamulussoftware/jamulus/pull/3343 Context: Fixes an issue?

Fixes: #3383

Does this change need documentation? What needs to be documented and how?

No

Status of this Pull Request

To be tested. Unfortunately, also the close button on the chat on iOS crashes the application. I think this was documented somewhere and is probably due to a null pointer de-reference.

What is missing until this pull request can be merged?

Not sure

Checklist

• [x] I've verified that this Pull Request follows the general code principles
• [ ] I tested my code and it does what I want
• [ ] My code follows the style guide
• [ ] I waited some time after this Pull Request was opened and all GitHub checks completed without errors.
• [ ] I've filled all the content above

[ann0see]

BlissOS Android seems ok too.

[ann0see]

This doesn't seem to be enough. In general, the chat window seems very buggy on iOS with Qt6. The aspect ratio is off and tapping on close hangs he app. Not sure how to continue here.

[pljones]

Do we want to leave this and see if the Qt overhaul in Jamulus 4 helps? Will #3413 help?

[ann0see]

Unfortunately it doesn't seem to work since some text boxes overlap.

[ann0see]

I think we'd rather close this and try out other approaches.