Verify captures are still present before showing them in connection

* If the RenderDoc UI connects to a program, opens then deletes the captures,
  then closes and is opened again - we don't want to report those deleted
  captures as if they still exist. This now clears out any captures that no
  longer exist.

renderdoc/core/core.cpp

@@ -1825,6 +1825,12 @@ void RenderDoc::AddChildThread(uint32_t pid, Threading::ThreadHandle thread)
   m_ChildThreads.push_back(make_rdcpair(pid, thread));
 }
 
+void RenderDoc::ValidateCaptures()
+{
+  SCOPED_LOCK(m_CaptureLock);
+  m_Captures.removeIf([](const CaptureData &cap) { return !FileIO::exists(cap.path); });
+}
+
 rdcarray<CaptureData> RenderDoc::GetCaptures()
 {
   SCOPED_LOCK(m_CaptureLock);

renderdoc/core/core.h

@@ -453,6 +453,7 @@ public:
   void CompleteChildThread(uint32_t pid);
   void AddChildThread(uint32_t pid, Threading::ThreadHandle thread);
 
+  void ValidateCaptures();
   rdcarray<CaptureData> GetCaptures();
 
   void MarkCaptureRetrieved(uint32_t idx);

renderdoc/core/target_control.cpp

@@ -152,6 +152,8 @@ void RenderDoc::TargetControlClientThread(uint32_t version, Network::Socket *cli
   const int progresstime = 100;    // update capture progress every 100ms
   int curtime = 0;
 
+  RenderDoc::Inst().ValidateCaptures();
+
   rdcarray<CaptureData> captures;
   rdcarray<rdcpair<uint32_t, uint32_t> > children;
   std::map<RDCDriver, bool> drivers;