Reduce number of refreshes and memory usage of cross references widget.

* Generates IL for cross references only when visible instead of all at once.
* Releases memory for IL after the cross references retrieves the
  tokens.
* Much faster algorithm for updating IL when functions change.
* Don't refresh cross references at all if the widget isn't visible.
  Retreiving the new set of cross references is deferred until the
  widget becomes visible again.
* Don't redo the query for the list of cross references when anything in
  the entire UI changes, even the window layout. Only recompute the list
  when an event for a new cross reference selection comes in.

1 files changed, 3 insertions, 0 deletions

diff --git a/function.cpp b/function.cpp
index 367dbe80..19d3fbc7 100644
--- a/function.cpp
+++ b/function.cpp
@@ -3566,6 +3566,9 @@ AdvancedFunctionAnalysisDataRequestor& AdvancedFunctionAnalysisDataRequestor::op
 
 void AdvancedFunctionAnalysisDataRequestor::SetFunction(Function* func)
 {
+	if (m_func.GetPtr() == func)
+		return;
+
 	if (m_func)
 		m_func->ReleaseAdvancedAnalysisData();