ux: add current caret position indicator (only column) #4403

Job	Run time
Prepare version string	5s
Build / Build Linux (arm64)	3m 34s
Build / Build Linux	3m 17s
Build / Build macOS (Apple Silicon)	3m 5s
Build / Build macOS (Intel)	3m 54s
Build / Build Windows ARM64	3m 34s
Build / Build Windows x64	3m 34s
Package / Package Windows (win-x64)	24s
Package / Package macOS (osx-arm64)	21s
Package / Package macOS (osx-x64)	16s
Package / Package Windows (win-arm64)	29s
Package / Package Linux (linux-x64)	1m 4s
Package / Package Linux (linux-arm64)	48s
	24m 25s

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