Capture file retapping fixups.

Add CaptureFile::delayedRetapPackets, which starts retapping after the
current batch of UI event are processed. Call it in the constructors of
various dialogs so that they are shown before tapping starts.

This *might* fix a crash found when following large streams from the
Conversations dialog.

Change-Id: If1b87491621ab7efcc0519f95891d34dcd9d18c1
Reviewed-on: https://code.wireshark.org/review/9818
Petri-Dish: Gerald Combs <gerald@wireshark.org>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Gerald Combs <gerald@wireshark.org>

ui/qt/capture_file.cpp

@@ -36,6 +36,7 @@ capture_file cfile;
 #include "ui/capture.h"
 
 #include <QFileInfo>
+#include <QTimer>
 
 // To do:
 // - Add getters and (if needed) setters:
@@ -96,6 +97,11 @@ void CaptureFile::retapPackets()
     }
 }
 
+void CaptureFile::delayedRetapPackets()
+{
+    QTimer::singleShot(0, this, SLOT(retapPackets()));
+}
+
 void CaptureFile::reload()
 {
     if (cap_file_ && cap_file_->state == FILE_READ_DONE) {

ui/qt/capture_file.h

@@ -68,10 +68,6 @@ public:
      */
     const QString fileName();
 
-    /** Retap the capture file
-     */
-    void retapPackets();
-
     /** Re;load the capture file
      */
     void reload();
@@ -107,11 +103,26 @@ signals:
     void captureCaptureFailed(capture_session *cap_session);
 
 public slots:
+    /** Retap the capture file. Convenience wrapper for cf_retap_packets.
+     * Application events are processed periodically via update_progress_dlg.
+     */
+    void retapPackets();
+
+    /** Retap the capture file after the current batch of application events
+     * is processed. If you call this instead of retapPackets or
+     * cf_retap_packets in a dialog's constructor it will be displayed before
+     * tapping starts.
+     */
+    void delayedRetapPackets();
+
     /** Cancel any tapping that might be in progress.
      */
     void stopLoading();
 
-    // XXX Not used.
+    /** Sets the capture file's "stop_flag" member.
+     *
+     * @param stop_flag If true, stops the current capture file operation.
+     */
     void setCaptureStopFlag(bool stop_flag = true);
 
 private:

ui/qt/conversation_dialog.cpp

@@ -98,7 +98,7 @@ ConversationDialog::ConversationDialog(QWidget &parent, CaptureFile &cf, int cli
     updateWidgets();
     itemSelectionChanged();
 
-    cap_file_.retapPackets();
+    cap_file_.delayedRetapPackets();
 }
 
 ConversationDialog::~ConversationDialog()
@@ -228,7 +228,7 @@ void ConversationDialog::followStream()
     }
 
     emit filterAction(filter, FilterAction::ActionApply, FilterAction::ActionTypePlain);
-    openFollowStreamDialog(ftype);
+    emit openFollowStreamDialog(ftype);
 }
 
 void ConversationDialog::graphTcp()

ui/qt/endpoint_dialog.cpp

@@ -85,7 +85,7 @@ EndpointDialog::EndpointDialog(QWidget &parent, CaptureFile &cf, int cli_proto_i
 #endif
     itemSelectionChanged();
 
-    cap_file_.retapPackets();
+    cap_file_.delayedRetapPackets();
 }
 
 EndpointDialog::~EndpointDialog()

ui/qt/main_window_slots.cpp

@@ -2528,8 +2528,8 @@ void MainWindow::openFollowStreamDialog(follow_type_t type) {
     connect(fsd, SIGNAL(updateFilter(QString&, bool)), this, SLOT(filterPackets(QString&, bool)));
     connect(fsd, SIGNAL(goToPacket(int)), packet_list_, SLOT(goToPacket(int)));
 
-    fsd->follow(getFilter());
     fsd->show();
+    fsd->follow(getFilter());
 }
 
 void MainWindow::on_actionAnalyzeFollowTCPStream_triggered()

ui/qt/response_time_delay_dialog.cpp

@@ -262,7 +262,7 @@ void ResponseTimeDelayDialog::fillTree()
 
     statsTreeWidget()->setSortingEnabled(false);
 
-    cf_retap_packets(cap_file_.capFile());
+    cap_file_.retapPackets();
 
     tapDraw(&rtd_data);
 

ui/qt/service_response_time_dialog.cpp

@@ -317,7 +317,7 @@ void ServiceResponseTimeDialog::fillTree()
 
     statsTreeWidget()->setSortingEnabled(false);
 
-    cf_retap_packets(cap_file_.capFile());
+    cap_file_.retapPackets();
 
     // We only have one table. Move its tree items up one level.
     if (statsTreeWidget()->invisibleRootItem()->childCount() == 1) {

ui/qt/simple_statistics_dialog.cpp

@@ -261,7 +261,7 @@ void SimpleStatisticsDialog::fillTree()
         reject();
     }
 
-    cf_retap_packets(cap_file_.capFile());
+    cap_file_.retapPackets();
 
     tapDraw(&stat_data);
 

ui/qt/voip_calls_dialog.cpp

@@ -192,7 +192,7 @@ VoipCallsDialog::VoipCallsDialog(QWidget &parent, CaptureFile &cf, bool all_flow
     updateWidgets();
 
     tapinfo_.session = cap_file_.capFile()->epan;
-    cap_file_.retapPackets();
+    cap_file_.delayedRetapPackets();
 }
 
 VoipCallsDialog::~VoipCallsDialog()