[Therion] XtTherion canvas zoom with the mouse wheel bug

[Bruce Mutton]

Hello

I have an old paper survey, so am doing some old school map drawing over a
scanned background sketch.  My first for a few years.

I have noticed that XTherion seems to not be able to display the background
sketch once you have used the mouse wheel to zoom.  The sketch just
vanishes, even though everything looks OK.

 

Using the magic of version control I can see that the only significant
change that XTherion makes to the dataset is that the ##XTHERION## variable
is no longer one of the present values.

ie 100 has changed to 62 in response to the mouse wheel zoom.

 



 

There are no problems if I use xvi file sketches as generated from
PocketTopo, so it is just a bitmap thing I suppose.

 

If I manually change the value above back to 100, the image displays just
fine.

The + -  zoom button on the interface work just fine as well.

 

I am using 5.4.1 - 88c8a06

 

Mouse wheel zoom is a nice feature, so it would be worth finding a fix for
this.

 

Bruce

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