Show the selected char when drawing

[Esshahn]

When drawing, only the rectangle border is shown.

Instead, the selected character should be displayed, so that one can immediately see

• what character you're drawing with
• how it would like if you click (before you click)

[nurpax]

Agreed. This is how I had it earlier but it got dropped in some refactoring but I intended to add it back.

[nurpax]

Done for showing current char. But need colorize support too.