Fix initial cursor position in empty TextField when TextAlignment is set explicitly

[mazunin-v-jb]

After focusing on the textfield and before entering any text, now blinking cursor will be positioned in accordance with TextAlignment.

Fixes https://youtrack.jetbrains.com/issue/COMPOSE-1360/
Fixes JetBrains/compose-multiplatform#2711
Fixes JetBrains/compose-multiplatform#3098
Fixes JetBrains/compose-multiplatform#4611

Testing

Manual testing.

Release Notes

Fixes - Multiple Platforms

• Fix initial cursor position in the empty TextField with explicitly set TextAlignment.

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[m-sasha]

No need to put it in a variable, just use it at the one place where it's needed.
It's both safer (no need to understand whether the value can change) and takes less memory.

[m-sasha]

You should add unit tests for this.
You can check the cursor position with

BasicTextField(
    ...
    onTextLayout = {
        println(it.getCursorRect(0))
    }
}

[MatkovIvan]

LGTM. Agree with @m-sasha, let's add unit tests for it

[MatkovIvan]

It seems we have one more issue duplicate - JetBrains/compose-multiplatform#2711