UIA in Win Console: fix setEndPoint/compareEndPoints (PR #10057)

Closes #10035
Related to #9614
Identical to #10043

Works around a UIA bug on Windows 10 1803 and later that means we can
not trust the "end" endpoint of a collapsed (empty) text range for comparisons. 
The console incorrectly reports the "end" as being past the "start" endpoint.

This stops braille being able to properly track the system caret in Windows Console.

Instead use getText(1) on the textRange to attempt to fetch 1 character.
getText returns an empty string for a collapsed range. By definition, the "start" and
"end" endpoints for a collapsed range are equivalent, thus read from the "start"
endpoint of a collapsed range instead of the "end" endpoint.

source/NVDAObjects/UIA/winConsoleUIA.py

@@ -153,15 +153,49 @@ def expand(self, unit):
 		else:
 			return super(consoleUIATextInfo, self).expand(unit)
 
-	def _get_isCollapsed(self):
+	def compareEndPoints(self, other, which):
 		"""Works around a UIA bug on Windows 10 1803 and later."""
 		# Even when a console textRange's start and end have been moved to the
 		# same position, the console incorrectly reports the end as being
 		# past the start.
-		# Therefore to decide if the textRange is collapsed,
-		# Check if it has no text.
+		# Compare to the start (not the end) when collapsed.
+		selfEndPoint, otherEndPoint = which.split("To")
+		if selfEndPoint == "end" and not self._isCollapsed():
+			selfEndPoint = "start"
+		if otherEndPoint == "End" and not other._isCollapsed():
+			otherEndPoint = "Start"
+		which = f"{selfEndPoint}To{otherEndPoint}"
+		return super().compareEndPoints(other, which=which)
+
+	def setEndPoint(self, other, which):
+		"""Override of L{textInfos.TextInfo.setEndPoint}.
+		Works around a UIA bug on Windows 10 1803 and later that means we can
+		not trust the "end" endpoint of a collapsed (empty) text range
+		for comparisons.
+		"""
+		selfEndPoint, otherEndPoint = which.split("To")
+		# In this case, there is no need to check if self is collapsed
+		# since the point of this method is to change its text range, modifying the "end" endpoint of a collapsed
+		# text range is fine.
+		if otherEndPoint == "End" and not other._isCollapsed():
+			otherEndPoint = "Start"
+		which = f"{selfEndPoint}To{otherEndPoint}"
+		return super().setEndPoint(other, which=which)
+
+	def _isCollapsed(self):
+		"""Works around a UIA bug on Windows 10 1803 and later that means we
+		cannot trust the "end" endpoint of a collapsed (empty) text range
+		for comparisons.
+		Instead we check to see if we can get the first character from the
+		text range. A collapsed range will not have any characters
+		and will return an empty string."""
 		return not bool(self._rangeObj.getText(1))
 
+	def _get_isCollapsed(self):
+		# To decide if the textRange is collapsed,
+		# Check if it has no text.
+		return self._isCollapsed
+
 	def _getCurrentOffsetInThisLine(self, lineInfo):
 		"""
 		Given a caret textInfo expanded to line, returns the index into the