[byg r2589] Text input box caret doesn't move to right

[z9999]

If caret positon is the front of text, caret doesn't move to right with right arrow key. (Tested with GDI version)

How to reproduce:
1. Click text input box.
2. Press left arrow key several times and move caret to the front of text.
3. Press right allow key

Result:
Caret doesn't move to right.
It worked in previous versions.

[Dwachs]

solved in 2590