Test/warning cleanups #2608

Job	Run time
Java_21 (chromium)	4m 41s
stable (ubuntu-latest, chrome)	5m 7s
Java_21 (firefox)	10m 31s
dev (ubuntu-latest, chromium)	5m 17s
stable (windows-latest, chrome)	9m 4s
Java_21 (webkit)	1h 0m 14s
dev (ubuntu-latest, firefox)	10m 34s
dev (ubuntu-latest, webkit)	30m 13s
stable (macos-latest, chrome)	9m 52s
dev (windows-latest, chromium)	7m 57s
dev (windows-latest, firefox)	12m 24s
stable (windows-latest, msedge)	16m 39s
dev (windows-latest, webkit)	8m 26s
stable (macos-latest, msedge)	25m 30s
dev (macos-latest, chromium)	6m 2s
dev (macos-latest, firefox)	10m 34s
dev (macos-latest, webkit)	30m 14s
	4h 23m 19s

Provide feedback