TimelineItem: fix handling of left-clicks on the author with Qt 6 #637

Job	Run time
Prepare	2s
Build (ubuntu-22.04, 6, own-quotient)	5m 14s
Build (ubuntu-22.04, 6, static)	4m 38s
Build (ubuntu-22.04, 6, dynamic)	5m 44s
Build (ubuntu-22.04, 6, GCC, own-quotient)	6m 53s
Build (ubuntu-22.04, 6, GCC, static)	7m 12s
Build (ubuntu-22.04, 6, GCC, dynamic)	6m 9s
Build (macos-latest, 6, own-quotient)	2m 47s
Build (macos-latest, 6, static)	2m 45s
Build (windows-latest, 6, own-quotient)	8m 39s
Build (windows-latest, 6, static)	6m 22s
Build (ubuntu-22.04, 5, own-quotient, appstream)	5m 12s
Build (ubuntu-22.04, 5, static)	3m 38s
Build (ubuntu-22.04, 5, dynamic, codeql)	6m 46s
Publish	0s
	1h 12m 1s

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