ux: caret brush when pre-edit text is available #4401

Job	Run time
Prepare version string	3s
Build / Build Windows ARM64	3m 51s
Build / Build Windows x64	3m 56s
Build / Build macOS (Apple Silicon)	3m 14s
Build / Build Linux	3m 20s
Build / Build Linux (arm64)	3m 18s
Build / Build macOS (Intel)	4m 18s
Package / Package Windows (win-arm64)	23s
Package / Package Windows (win-x64)	26s
Package / Package macOS (osx-arm64)	15s
Package / Package macOS (osx-x64)	15s
Package / Package Linux (linux-arm64)	1m 6s
Package / Package Linux (linux-x64)	1m 6s
	25m 31s

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