[Octave-bug-tracker] [bug #52631] Add horizontal and vertical zoom controls

[Marshall]

Follow-up Comment #3, bug #52631 (project octave):

Thanks! That gives me a way to do what I want when I really need it. I didn't
realize 'zoom xon' and 'zoom yon' were already available because I was looking
for that functionality through the figure gui interface.  

Both uimenu and uicontextmenu are helpful, but I don't know of a way to create
them with every new figure. I though of setting groot uicontextmenu or
attaching a uimenu to groot so that new figures would have them by default,
but that doesn't work. It would be nice to have a way to set this up in a
startup script so it's always automatically available. 

I noticed another convenient way of accessing x or y zoom controls in recent
versions of Matlab: When the zoom drag window is very narrow (e.g. nearly
horizontal or vertical), then x or y zoom is activated. The zoom box changes
to something that looks like a horizontal or vertical error bar to indicate
that an x or y zoom will occur. It is a very simple (to use) way to access
that functionality for zooming in, though it doesn't help for zooming out in x
or y only.

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