Give new footprint libraries a dummy name in the file dialog

If they don't have a dummy name, then GTK will display the regex
for the extension in the dialog.

Fixes https://gitlab.com/kicad/code/kicad/issues/5365

common/eda_draw_frame.cpp

@@ -884,6 +884,10 @@ bool EDA_DRAW_FRAME::LibraryFileBrowser( bool doOpen, wxFileName& aFilename,
     }
     else
     {
+        // Ensure the file has a dummy name, otherwise GTK will display the regex from the filter
+        if( aFilename.GetName().empty() )
+            aFilename.SetName( "Library" );
+
         wxString dir = Prj().IsNullProject() ? aFilename.GetFullPath() : Prj().GetProjectPath();
 
         wxFileDialog dlg( this, prompt, dir, aFilename.GetFullName(),

pcbnew/footprint_libraries_utils.cpp

@@ -505,16 +505,9 @@ bool PCB_BASE_EDIT_FRAME::AddLibrary( const wxString& aFilename )
         switch( SelectSingleOption( this, _( "Select Library Table" ),
                 _( "Choose the Library Table to add the library to:" ), libTableNames ) )
         {
-        case 0:
-            saveInGlobalTable = true;
-            break;
-
-        case 1:
-            saveInProjectTable = true;
-            break;
-
-        default:
-            return false;
+        case 0:  saveInGlobalTable  = true;  break;
+        case 1:  saveInProjectTable = true;  break;
+        default: return false;
         }
     }