can't type characters with accent

Problem:

On Latin-derived languages, accented characters (like á, à, é, í, ó, ú, ã, õ, ñ, ü) are very common. The problem is that accented characters cannot be typed on dash.

How to reproduce:

1. With Brazillian Portuguese translation installed, open dash
2. Type 'Apar'
3. The program 'Aparência' (Appearence) is listed
4. Try to type the letter 'ê'

What happens:

When you press the accent key, the graphic signal is drawn immediately (see screenshot)

What should happens:

The accent should not be drawn immediately. It should wait the next letter (e.g. press '^' and press 'e' should give 'ê')

Note:

If the next pressed key is a space, the accent should be draw alone, as in a normal text field (e.g. press '^' and press <space> should give '^')