Component chooser: show aliases better

- In the listing, display alias names in italics
- In the info panel, display per-alias description correctly, as well as
  root description

Fixes: lp:1676190
* https://bugs.launchpad.net/kicad/+bug/1676190

eeschema/cmp_tree_model_adapter.cpp

@@ -310,6 +310,33 @@ void CMP_TREE_MODEL_ADAPTER::GetValue(
 }
 
 
+bool CMP_TREE_MODEL_ADAPTER::GetAttr(
+            wxDataViewItem const&   aItem,
+            unsigned int            aCol,
+            wxDataViewItemAttr&     aAttr ) const
+{
+    auto node = ToNode( aItem );
+    wxASSERT( node );
+
+    if( node->Type != CMP_TREE_NODE::ALIAS )
+    {
+        // Currently only aliases are formatted at all
+        return false;
+    }
+
+    if( node->Alias && !node->Alias->IsRoot() && aCol == 0 )
+    {
+        // Names of non-root aliases are italicized
+        aAttr.SetItalic( true );
+        return true;
+    }
+    else
+    {
+        return false;
+    }
+}
+
+
 int CMP_TREE_MODEL_ADAPTER::ColWidth( CMP_TREE_NODE& aTree, int aCol, wxString const& aHeading )
 {
     const int indent = aCol ? 0 : kDataViewIndent;

eeschema/cmp_tree_model_adapter.h

@@ -87,6 +87,7 @@ class PART_LIBS;
  * - `GetColumnType()` - get the data type shown in each column
  * - `GetValue()` - get the data shown in a cell
  * - `SetValue()` - edit the data in a cell (does nothing)
+ * - `GetAttr()` - get any per-item formatting
  * - `Compare()` - compare two rows, for sorting
  * - `HasDefaultCompare()` - whether sorted by default
  */
@@ -288,6 +289,19 @@ protected:
             wxDataViewItem const&   aItem,
             unsigned int            aCol ) override { return false; }
 
+    /**
+     * Get any formatting for an item.
+     *
+     * @param aItem     item to get formatting for
+     * @param aCol      column number of interest
+     * @param aAttr     receiver for attributes
+     * @return          true iff the item has non-default attributes
+     */
+    virtual bool GetAttr(
+            wxDataViewItem const&   aItem,
+            unsigned int            aCol,
+            wxDataViewItemAttr&     aAttr ) const override;
+
 private:
     CMP_FILTER_TYPE     m_filter;
     bool                m_show_units;

eeschema/generate_alias_info.cpp

@@ -31,7 +31,7 @@ static const wxString DescriptionFormat =
     "__FIELDS__"
     "</table>";
 
-static const wxString AliasOfFormat =   "<br><i>" + _( "Alias of " ) + "%s</i>";
+static const wxString AliasOfFormat =   "<br><i>" + _( "Alias of " ) + "%s (%s)</i>";
 static const wxString DescFormat =      "<br>%s";
 static const wxString KeywordsFormat =  "<br>" + _( "Keywords:" ) + " %s";
 static const wxString FieldFormat =
@@ -90,37 +90,28 @@ protected:
         }
         else
         {
+            wxString root_name = _( "Unknown" );
+            wxString root_desc = "";
+
             LIB_PART* root = m_part->GetPart();
-            const wxString root_name = ( root ? root->GetName() : _( "Unknown" ) );
+            LIB_ALIAS* root_alias = root ? root->GetAlias( 0 ) : nullptr;
+
+            if( root )
+                root_name = root->GetName();
+
+            if( root_alias )
+                root_desc = root_alias->GetDescription();
+
             m_html.Replace(
-                "__ALIASOF__", wxString::Format( AliasOfFormat, EscapedHTML( root_name ) ) );
+                "__ALIASOF__", wxString::Format(
+                    AliasOfFormat, EscapedHTML( root_name ), EscapedHTML( root_desc ) ) );
         }
     }
 
 
     void SetHtmlDesc()
     {
-        wxString raw_desc;
-
-        if( m_part->IsRoot() )
-        {
-            raw_desc = m_part->GetDescription();
-        }
-        else
-        {
-            LIB_PART* root = m_part->GetPart();
-
-            for( size_t i = 0; i < root->GetAliasCount(); ++i )
-            {
-                LIB_ALIAS* alias = root->GetAlias( i );
-
-                if( alias && !alias->GetDescription().empty() )
-                {
-                    raw_desc = alias->GetDescription();
-                    break;
-                }
-            }
-        }
+        wxString raw_desc = m_part->GetDescription();
 
         m_html.Replace( "__DESC__", wxString::Format( DescFormat, EscapedHTML( raw_desc ) ) );
     }