Fix #50 by zooming in a level

The reportFocus() function handles the zoom since that seems to be where NVDA first tells MathCAT it should navigate.
An alternative would be in `script_navigate`. In there, `gesture` is `None`. It seems cleaner in reportFocus().

I needed to remove the 'SetMathML' call in `__init__` because that wipes out the navigation state.
As far as I could see, nothing bad happens with that call removed.

Author: NSoiffer

NVDA-addon/addon/globalPlugins/MathCAT/MathCAT.py

@@ -133,17 +133,12 @@ def __init__(self, provider=None, mathMl: Optional[str]=None):
         super(MathCATInteraction, self).__init__(provider=provider, mathMl=mathMl)
         provider._setSpeechLanguage(mathMl)
         self.init_mathml = mathMl
-        try:
-            libmathcat.SetMathML(mathMl)
-        except Exception as e:
-            speech.speakMessage(_("Illegal MathML found: see NVDA error log for details"))
-            log.error(e)
 
     def reportFocus(self):
         super(MathCATInteraction, self).reportFocus()
         try:
-            speech.speak(ConvertSSMLTextForNVDA(libmathcat.GetSpokenText(),
-                        self.provider._language))
+            text = libmathcat.DoNavigateCommand("ZoomIn")
+            speech.speak(ConvertSSMLTextForNVDA(text, self.provider._language))
         except Exception as e:
             log.error(e)
             speech.speakMessage(_("Error in speaking math: see NVDA error log for details"))
@@ -182,7 +177,7 @@ def getScript(self, gesture: KeyboardInputGesture):
     def script_navigate(self, gesture: KeyboardInputGesture):
         # log.info("***MathCAT script_navigate")
         try:
-            if gesture != None:
+            if gesture != None:     # == None when initial focus -- handled in reportFocus()
                 modNames = gesture.modifierNames
                 text = libmathcat.DoNavigateKeyPress(gesture.vkCode,
                     "shift" in modNames, "control" in modNames, "alt" in modNames, False)