Neither ETree::key-press nor ETableItem::key-press signal definitions
specify a GSignalAccumulator that terminates the signal emission when
a handler returns TRUE, and Evolution 2.29 connects multiple handlers
to ETree::key-press.
When the space key is pressed, the first handler implements the magic
space bar behavior and returns TRUE, which should terminate signal
emission but doesn't because there's no accumulator function on the
signal. So the second handler runs and checks for other keys besides
space. It returns FALSE since it didn't handle the key press.
End result: emission site gets back FALSE (from the second handler) as
the return value, so it thinks the key press was not handled at all and
invokes the fallback handler -- e_selection_model_toggle_single_row() --
which -unselects- the newly selected row, making it appear the next
unread message was never selected.
Several other ETable-related signals that return "handled" flags also
lack GSignalAccumulator functions. I've made a note to myself to fix
those as well.
Matthew Barnes
e9dc381d3a