Searching with 'Q' seems to be capped to 9 or 10 characters, depending on how wide the characters you type are (try with 12345689A and 1234567891 to see slightly different results). It could be useful to have some more, ideally at least 12 or 15 *). However, in some contexts there isn't enough space in the GUI for a much longer field.
Would it be feasible to implement the search field either as:
a) the displayed width is fixed, but the text keeps rolling to the right as you type it longer (and the start vanishes from sight). Then the search string could be essentially of infinite length.
b) like a) but as you keep typing, it still shows only the first 9-10 characters (no rolling), but you just have to write the rest of the string 'blind'.
Either of these would work for me, but a) would be more user-friendly.
*) For example, in XCF with a big tech tree, I just wanted to search for 'syndicate security', preferable I'd have typed 'syndicate sec' to find just that, not everything else related to the syndicate.