TOC rebuilds on every cursor move

[Kornel Benko]

The effect is at least questionable.
I am using QT5.9.5 (Standard on this ubuntu). Disturbing.
Recompiled with QT5.11, I don't see it anymore.

	Kornel
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 488 bytes
Desc: Digitale Signatur von OpenPGP
URL: <http://lists.lyx.org/pipermail/lyx-devel/attachments/20200614/ed33ef5d/attachment.asc>