Once more into the depths of hell... er, I mean fix a focus issue.

So the new steals-focus protection stuff works well when there's a
focused control, but not as well when there's a modal dialog up which
happens not to have a focused control (or worse, a focusable control).

This adds a second mechanism for also checking to see if a modal dialog
is up (something that wxWidgets, true to form, makes very difficult).

Fixes https://gitlab.com/kicad/code/kicad/issues/6520

common/dialog_shim.cpp

@@ -27,7 +27,6 @@
 #include <kiway_player.h>
 #include <pgm_base.h>
 #include <tool/tool_manager.h>
-
 #include <kiplatform/ui.h>
 
 #include <wx/display.h>
@@ -320,9 +319,9 @@ void DIALOG_SHIM::OnPaint( wxPaintEvent &event )
         selectAllInTextCtrls( GetChildren() );
 
         if( m_initialFocusTarget )
-            m_initialFocusTarget->SetFocus();
+            KIPLATFORM::UI::ForceFocus( m_initialFocusTarget );
         else
-            SetFocus();     // Focus the dialog itself
+            KIPLATFORM::UI::ForceFocus( this );     // Focus the dialog itself
 
         m_firstPaintEvent = false;
     }

common/draw_panel_gal.cpp

@@ -501,7 +501,9 @@ bool EDA_DRAW_PANEL_GAL::SwitchBackend( GAL_TYPE aGalType )
 
 void EDA_DRAW_PANEL_GAL::OnEvent( wxEvent& aEvent )
 {
-    bool shouldSetFocus = m_lostFocus && m_stealsFocus && !KIUI::IsInputControlFocused();
+    bool shouldSetFocus = m_lostFocus && m_stealsFocus
+                            && !KIUI::IsInputControlFocused()
+                            && !KIUI::IsModalDialogFocused();
 
 #if defined( _WIN32 )
     // Ensure we are the active foreground window before we attempt to steal focus
@@ -523,7 +525,9 @@ void EDA_DRAW_PANEL_GAL::OnEvent( wxEvent& aEvent )
 
 void EDA_DRAW_PANEL_GAL::onEnter( wxMouseEvent& aEvent )
 {
-    bool shouldSetFocus = m_stealsFocus && !KIUI::IsInputControlFocused();
+    bool shouldSetFocus = m_stealsFocus
+                            && !KIUI::IsInputControlFocused()
+                            && !KIUI::IsModalDialogFocused();
 
 #if defined( _WIN32 )
     // Ensure we are the active foreground window before we attempt to steal focus

common/pgm_base.cpp

@@ -101,6 +101,7 @@ PGM_BASE::PGM_BASE()
     m_pgm_checker = NULL;
     m_locale = NULL;
     m_Printing = false;
+    m_ModalDialogCount = 0;
 
     m_show_env_var_dialog = true;
 

common/single_top.cpp

@@ -226,6 +226,19 @@ struct APP_SINGLE_TOP : public wxApp
         return ret;
     }
 
+    int FilterEvent( wxEvent& aEvent ) override
+    {
+        if( aEvent.GetEventType() == wxEVT_SHOW )
+        {
+            wxShowEvent& event = static_cast<wxShowEvent&>( aEvent );
+            wxDialog*    dialog = dynamic_cast<wxDialog*>( event.GetEventObject() );
+
+            if( dialog && dialog->IsModal() )
+                Pgm().m_ModalDialogCount += event.IsShown() ? 1 : -1;
+        }
+
+        return Event_Skip;
+    }
 
 #if defined( DEBUG )
     /**

common/widgets/ui_common.cpp

@@ -23,7 +23,8 @@
 #include <widgets/ui_common.h>
 
 #include <algorithm>
-#include <gal/color4d.h>
+#include <dialog_shim.h>
+#include <pgm_base.h>
 
 int KIUI::GetStdMargin()
 {
@@ -142,4 +143,10 @@ bool KIUI::IsInputControlFocused()
     wxDataViewCtrl*   dataViewCtrl = dynamic_cast<wxDataViewCtrl*>( focus );
 
     return ( textEntry || styledText || listBox || dataViewCtrl );
+}
+
+
+bool KIUI::IsModalDialogFocused()
+{
+    return Pgm().m_ModalDialogCount > 0;
 }

eeschema/dialogs/dialog_update_from_pcb.cpp

@@ -159,6 +159,9 @@ void DIALOG_UPDATE_FROM_PCB::OnUpdateClick( wxCommandEvent& event )
 
         if( m_cbRelinkFootprints->GetValue() )
             backAnno.PushNewLinksToPCB();
+
+        m_sdbSizerCancel->SetDefault();
+        m_sdbSizerOK->Enable( false );
     }
 
     m_messagePanel->Flush( false );

include/pgm_base.h

@@ -340,6 +340,8 @@ public:
      */
     bool m_Printing;
 
+    int  m_ModalDialogCount;
+
 protected:
 
     /// Loads internal settings from COMMON_SETTINGS

include/widgets/ui_common.h

@@ -74,6 +74,8 @@ void SelectReferenceNumber( wxTextEntry* aTextEntry );
  */
 bool IsInputControlFocused();
 
+bool IsModalDialogFocused();
+
 }
 
 // Note: On windows, SEVERITY_ERROR collides with a system declaration,

kicad/kicad.cpp

@@ -307,6 +307,20 @@ struct APP_KICAD : public wxApp
         return -1;
     }
 
+    int FilterEvent( wxEvent& aEvent ) override
+    {
+        if( aEvent.GetEventType() == wxEVT_SHOW )
+        {
+            wxShowEvent& event = static_cast<wxShowEvent&>( aEvent );
+            wxDialog*    dialog = dynamic_cast<wxDialog*>( event.GetEventObject() );
+
+            if( dialog && dialog->IsModal() )
+                Pgm().m_ModalDialogCount += event.IsShown() ? 1 : -1;
+        }
+
+        return Event_Skip;
+    }
+
     /**
      * Set MacOS file associations.
      *

pcbnew/dialogs/dialog_netlist.cpp

@@ -142,30 +142,24 @@ void DIALOG_NETLIST::OnOpenNetlistClick( wxCommandEvent& event )
 
 void DIALOG_NETLIST::OnUpdatePCB( wxCommandEvent& event )
 {
-    BOARD*     pcb = m_parent->GetBoard();
     wxFileName fn = m_NetlistFilenameCtrl->GetValue();
 
     if( !fn.IsOk() )
     {
-        wxMessageBox( _("Please, choose a valid netlist file.") );
+        wxMessageBox( _( "Please, choose a valid netlist file." ) );
         return;
     }
 
     if( !fn.FileExists() )
     {
-        wxMessageBox( _("The netlist file does not exist.") );
+        wxMessageBox( _( "The netlist file does not exist." ) );
         return;
     }
 
-    // Give the user a chance to bail out when making changes from a netlist.
-    if( pcb->IsEmpty() || IsOK( this, _( "The changes made cannot be undone.  "
-                                         "Are you sure you want to update the PCB?" ) ) )
-    {
-        m_MessageWindow->SetLabel( _( "Changes Applied To PCB" ) );
-        loadNetlist( false );
+    m_MessageWindow->SetLabel( _( "Changes Applied to PCB" ) );
+    loadNetlist( false );
 
-        m_sdbSizer1Cancel->SetDefault();
-    }
+    m_sdbSizer1Cancel->SetDefault();
 }
 
 

pcbnew/dialogs/dialog_update_pcb.cpp

@@ -24,7 +24,6 @@
 #include <pcb_edit_frame.h>
 #include <pcbnew_settings.h>
 #include <dialog_update_pcb.h>
-
 #include <ratsnest/ratsnest_data.h>
 #include <wx_html_report_panel.h>
 #include <netlist_reader/pcb_netlist.h>
@@ -33,7 +32,7 @@
 #include <tools/pcb_actions.h>
 #include <tools/selection_tool.h>
 #include <kiface_i.h>
-
+#include <kiplatform/ui.h>
 
 bool DIALOG_UPDATE_PCB::m_warnForNoNetPads = false;
 
@@ -129,13 +128,20 @@ void DIALOG_UPDATE_PCB::PerformUpdate( bool aDryRun )
 void DIALOG_UPDATE_PCB::OnOptionChanged( wxCommandEvent& event )
 {
     if( m_initialized )
+    {
         PerformUpdate( true );
+        m_sdbSizer1OK->Enable( true );
+        m_sdbSizer1OK->SetDefault();
+    }
 }
 
 
 void DIALOG_UPDATE_PCB::OnUpdateClick( wxCommandEvent& event )
 {
-    m_messagePanel->SetLabel( _( "Changes Applied To PCB" ) );
+    m_messagePanel->SetLabel( _( "Changes Applied to PCB" ) );
     PerformUpdate( false );
+
     m_sdbSizer1Cancel->SetDefault();
+    // Widgets has a tendency to keep both buttons highlighted without the following:
+    m_sdbSizer1OK->Enable( false );
 }