[GUI] Multiple cursors in labels

[sampletext32]

On the very latest master I suddenly found this behaviour. I can place multiple cursors in labels.

This one is always displayed when I open a Help window

I think, this is undesired.

My PC Specs:
Core I5 10210U (4c/8t) 2.1 Ghz
UHD630 / MX250 2Gb
8Gb DDR4 SO-DIMM 2667Mhz
1920*1080 100% Scale Monitor
Note: I don't test games with this rig.

[sampletext32]

Can reproduce on another rig.

9750H
HD630 / RTX2060
1920*1080 100% Scale Display.

[sampletext32]

@Megamouse, I've made some research and found out that about_dialog.ui contains the exact same header as welcome_dialog.ui. So I compared the markup and found the difference.

<property name="textInteractionFlags">
    <set>Qt::TextSelectableByKeyboard|Qt::TextSelectableByMouse</set>
</property>

It seems like this small piece of code makes it possible to select texts in about_dialog. But it also introduces this multiple cursors behaviour.
So there's a question. If it is really needed the texts to be copyable, than my Issue is useless. If it's not - than we can disable text copy, and multiple cursors disappear.
Waiting for your reply, so I can create a PR or close Issue.

[illusion0001]

I thought the behavior of those dialog boxes are read only and text can't be selected.