tests: Add edittext_selection_font_size test #26417

Job	Run time
Paths filter	6s
Check dependencies	1m 48s
Test Rust stable / ubuntu-24.04	4m 53s
Test Rust stable / windows-latest	13m 22s
Lints with Rust stable	4m 38s
Test Rust ${{ matrix.rust_version }} / ${{ matrix.os }}	0s
Test Rust stable / macos-14	3m 55s
Lints with Rust beta	4m 26s
Test Rust nightly / ubuntu-24.04	4m 33s
Lints with Rust nightly	4m 20s
Test Rust beta / ubuntu-24.04	5m 29s
	47m 30s

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