Key strokes in the home screen will fill the filter. On later view of an folder, the filter is applied without any knowledge of the user (if it would lead to a "No xyz in this folder"). Instead, the textfield should be shown in the homescreen, or (better) key presses in home screen do not fill up the filter. Observed in version 4:4.5~20101001.1181430-1maemo1.1181463 .
SVN commit 1182350 by tokoe: Do not forward key strokes to the filter lineedit when we are in HomeScreen mode BUG: 252936 M +5 -1 kdeclarativemainview.cpp WebSVN link: http://websvn.kde.org/?view=rev&revision=1182350
Confirmed, version 4:4.5~20101013.1185493-1maemo1.1185177 .