See:
https://www.qcad.org/rsforum/viewtopic.php?f=31&t=10379

Could you add "plain text paste" as ctrl-shift-V
Why? Because sometimes the clipboard comes in with rich text formatting that's anti-helpful.
The workaround is to paste into a plain text editor, or the console, then recopy and repaste into qCad.

Either way the ctrl-shift-V shortcut is useful for those trained on other software but:
one could also argue that qCad should NEVER take rich text, and rather only accept the plain text with both CTRL-V and CTRL-SHIFT-V.

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CHV says

Agreed, having encountered it numerous times while documenting with text snippets from elsewhere. :roll:
Even copying Info measurements from the Command Line are Rich Text.

The best place to file a feature request is QCAD Bugtracker:
https://www.ribbonsoft.com/bugtracker/
You may need a different account there or make a new one.

May I remark that Ctrl-Shift-V is already in use for Paste along Entity (PE)
But not when the Text Editor Widget has the focus and dialog Widgets are always modal on a Win OS system. :wink:
Still, I'll vote for it in any way.:P

Regards,
CVH