Clicking "select" button in qt plots hampers ginput() operation

[Philip Nienhuis]

(This may be due to me not understanding fully what the "select" button in Qt
plot windows does.)

I find that ginput() in qt plots, as soon as the select button (the arrow)
is clicked any number of times, calls of the form:

[x, y, b] = ginput ()

return only empty output after several mouse clicks in the plot, and 

[x, y, b] = ginput (1)
-or-
[x, y, b] = ginput (N)   #  (where N is a positive integer)

simply does not return after a mouse click as I believe it should (and also
returns empty output). On Linux hitting the Return key helps, on Windows
this doesn't help and Octave even gets hung.

The way out is to click e.g., the zoom-in ("+") button twice - that
apparently disengages the "select" button action.

Is this a bug? If yes I'll enter a bug report for it.
If not a bug, what is the "select" button good for? I'd assume it should
work a.o., to help ginput() "select" a point.

(FYI: I hit this when invoking ginput() on plots that were zoomed in - I
clicked "select" to disengage the zoom-in button rather than clicking the
zoom-in button another time)

Philip




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