refactor: simplify `BlockNavigation.UpdateByCaretPosition` #3711

Job	Run time
Prepare version string	4s
Build / Build Windows ARM64	3m 44s
Build / Build macOS (Intel)	5m 27s
Build / Build macOS (Apple Silicon)	2m 47s
Build / Build Linux	3m 15s
Build / Build Windows x64	3m 48s
Build / Build Linux (arm64)	3m 11s
Package / Package macOS (osx-x64)	19s
Package / Package macOS (osx-arm64)	14s
Package / Package Windows (win-x64)	27s
Package / Package Windows (win-arm64)	30s
Package / Package Linux (linux-x64)	55s
Package / Package Linux (linux-arm64)	49s
	25m 30s

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