Place the caret. Press Shift and then a downwards selection key (i.e. Down or Right arrow). As expected, you move the caret downwards correctly using either key.

However, after some text is selected, pressing Up or Left causes the caret to move to the start of the selection to expand (rather than allowing the leading edge of the selection to be reduced). All further shift-cursor key presses (Up/Down/Left/Right) only change the position of the earlier part of the selection, and you can no-longer select as desired.

Version: unspecified
Severity: normal