Reduce delay in keypress (input) in Query Tool

It has been noticed that on certain systems, that typing into the Query Tool is extremely slow and characters get printed very slowly. The probable reason behind this is on each key press in Query Tool OnChangeStc() gets called in frmQuery which in turn calls updateMenu(). In updateMenu() we call the canSaveAsImage(), which internally updates the ModelSize of GQB with the updateModelSize() function.

Attached is the patch that fixes this issue by disabling the call to canSaveAsImage() when called updateMenu() is called from OnChangeStc(). In this way the model size of GQB won't get updated on press of each key.

Let me know views/thoughts on the same.

Thanks,
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