Placeholder text in TextField disappears on TextField tap

1. Tap into text with placeholder

Expected
2. Cursor and keyboard appear, placeholder is shown

Actual
2. Cursor and keyboard appear, placeholder disappears
3. Interestingly if you click more, sometimes, but not always it appears again

Looking at TextField code, it seems to be wrong calculation of opacity in its placeholderTextComponent - possibly wrong detection of textInput.inputMethodComposing

On desktop same things work fine, it's iOS-specific issue

Steps for Android
1. Run placeholder.qml
2. Tap TextField
3. Type Q
4. Press backspace

Expected:
Placeholder text to appear

Actual:
No placeholder until input method is reset (by pressing input again etc)

Cause is probably same as on iOS see TextField.

When inputMethodComposing textInput.text.length does not change until inputMethod.commit()/reset(), maybe textInput.displayText.length would work better.