I click on a file at the bottom of a column in an open dialog.  I then shift+click on a file in the next column.  I would expect this to select all files inclusively between* the two that I clicked on.
*"between" in the sort order (in this case, by name), not by position on the screen as a click+drag select would do

Instead, a seemingly random selection of files are selected.  The selection is deterministic in that if I repeat the process, attempting to select the same range of files as before, then the same buggy selection is produced.

Reproducible: Always

Steps to Reproduce:
1. Launch an open dialog which permits multi-select (e.g. Kate->open)
2. click on a file in one column
3. shift+click on a file in another column
4. files outside the desired range are selected
Actual Results:  
Files outside the desired range are selected

Expected Results:  
Files inside the desired range, and only those files should be selected

Potential security issue if someone doesn't realise that they're attaching the wrong files to an email.