Qt: Update frame selected in several cases

Ensure that frameSelected(0) is emitted when not having a proto tree
field selected because of:

 1. No match when trying to restore selected field
 2. Search selects a packet with no field to select
 3. Current packet is deselected

This will disable functionality which requires a selected field
and updates the status bar according to selected field.

Bug: 14658
Change-Id: I158fae4f26c02f718cee0030ef9e38b597876381
Reviewed-on: https://code.wireshark.org/review/27395
Petri-Dish: Stig Bjørlykke <stig@bjorlykke.org>
Reviewed-by: Roland Knall <rknall@gmail.com>
Tested-by: Petri Dish Buildbot
Reviewed-by: Stig Bjørlykke <stig@bjorlykke.org>

3 files changed, 15 insertions, 8 deletions

diff --git a/ui/qt/main_status_bar.cpp b/ui/qt/main_status_bar.cpp
index 8fda4a5dac..b3bba9ba78 100644
--- a/ui/qt/main_status_bar.cpp
+++ b/ui/qt/main_status_bar.cpp
@@ -269,8 +269,10 @@ void MainStatusBar::selectedFieldChanged(FieldInformation * finfo)
 {
     QString item_info;
 
-    if ( ! finfo )
+    if ( ! finfo ) {
+        pushFieldStatus(item_info);
         return;
+    }
 
     FieldInformation::HeaderInfo hInfo = finfo->headerInfo();
 
diff --git a/ui/qt/packet_list.cpp b/ui/qt/packet_list.cpp
index 549f0eaa82..e75cb8b7a5 100644
--- a/ui/qt/packet_list.cpp
+++ b/ui/qt/packet_list.cpp
@@ -360,7 +360,8 @@ PacketListModel *PacketList::packetListModel() const {
     return packet_list_model_;
 }
 
-void PacketList::selectionChanged (const QItemSelection & selected, const QItemSelection & deselected) {
+void PacketList::selectionChanged (const QItemSelection & selected, const QItemSelection & deselected)
+{
     QTreeView::selectionChanged(selected, deselected);
 
     if (!cap_file_) return;
@@ -388,6 +389,7 @@ void PacketList::selectionChanged (const QItemSelection & selected, const QItemS
 
     if (!cap_file_->edt) {
         viewport()->update();
+        emit fieldSelected(0);
         return;
     }
 
@@ -402,9 +404,7 @@ void PacketList::selectionChanged (const QItemSelection & selected, const QItemS
         viewport()->update();
     }
 
-    if (cap_file_->search_in_progress &&
-        (cap_file_->search_pos != 0 || (cap_file_->string && cap_file_->decode_data)))
-    {
+    if (cap_file_->search_in_progress) {
         match_data  mdata;
         field_info *fi = NULL;
 
@@ -414,16 +414,19 @@ void PacketList::selectionChanged (const QItemSelection & selected, const QItemS
             if (cf_find_string_protocol_tree(cap_file_, cap_file_->edt->tree, &mdata)) {
                 fi = mdata.finfo;
             }
-        } else {
+        } else if (cap_file_->search_pos != 0) {
             // Find the finfo that corresponds to our byte.
             fi = proto_find_field_from_offset(cap_file_->edt->tree, cap_file_->search_pos,
                                               cap_file_->edt->tvb);
         }
 
         if (fi) {
-            emit fieldSelected(new FieldInformation(fi, this));
+            FieldInformation finfo(fi, this);
+            emit fieldSelected(&finfo);
+        } else {
+            emit fieldSelected(0);
         }
-    } else if (!cap_file_->search_in_progress && proto_tree_) {
+    } else if (proto_tree_) {
         proto_tree_->restoreSelectedField();
     }
 }
diff --git a/ui/qt/proto_tree.cpp b/ui/qt/proto_tree.cpp
index 26ffa2d38a..8b53332039 100644
--- a/ui/qt/proto_tree.cpp
+++ b/ui/qt/proto_tree.cpp
@@ -478,7 +478,9 @@ void ProtoTree::restoreSelectedField()
         cur_index = proto_tree_model_->index(row, 0, cur_index);
         FieldInformation finfo(proto_tree_model_->protoNodeFromIndex(cur_index).protoNode());
         if (!finfo.isValid() || finfo.headerInfo().id != hf_id) {
+            // Did not find the selected hfid path in the selected packet
             cur_index = QModelIndex();
+            emit fieldSelected(0);
             break;
         }
     }