Color codes show search status during word input

On the left of the search entry field, underneath the list box, is a small round status lamp. It reflects the current state of the search by changing color, like a street light. The colors used mean:

Black   The search field is empty.
Blue   The current state of entry does not correspond to any word or flection in your files, but through entry of further characters at least one occuring word may be found. The alphabetically closest occuring word is selected in the word list.
Green   The word occurs exactly as entered.
Yellow    The word occurs not exactly as typed, but in one of its flections.
Red   The word as typed occurs neither directly nor in a flection; the entry of further characters cannot lead to an occuring word. The user can give up the search or delete characters from the right until the color changes.
The word list is always marked at the alphabetically closest word to the current entry (irrespective of whether a direct occurence or flection exists).

Here's an example:

The user has performed an index run on a single file, containing only the two words "Auto" und "Automaten". In this trivial example she could naturally just mark the desired word in the list, but she chooses to enter it via the keyboard:

After entry of the first character "A" the color changes from black to blue:      Blue color
This remains the case until the word "Auto" has been entered. Since this word occurs in a file exactly as entered the color changes from blue to green:   Green color
After the next character "m" the focus in the list changes from "Auto" to "Automat" and the color returns to blue, until the word "Automat" has been entered. This word occurs - not directly but in its flection "Automaten", so the color changes to yellow:   Yellow color
The occuring flection is at once displayed in the flection window:   Flection color
At the next character "e" the color returns to blue, and finally by "n" back to green, since the word "Automaten" occurs exactly as entered:   Green color
If now any further character is entered, e.g. "v" for "Automatenverleih", the color will change to red. Thus the input is shown to have ended, because no further occurent word can be reached.   Red color