Resolve textvars before opening file browser.

Fixes https://gitlab.com/kicad/code/kicad/issues/6436

eeschema/dialogs/dialog_plot_schematic.cpp

@@ -1262,10 +1262,10 @@ wxString DIALOG_PLOT_SCHEMATIC::getOutputPath()
 
     // Build the absolute path of current output directory to preselect it in the file browser.
     std::function<bool( wxString* )> textResolver =
-    [&]( wxString* token ) -> bool
-    {
-        return m_parent->Schematic().ResolveTextVar( token, 0 );
-    };
+            [&]( wxString* token ) -> bool
+            {
+                return m_parent->Schematic().ResolveTextVar( token, 0 );
+            };
 
     wxString path = m_outputDirectoryName->GetValue();
     path = ExpandTextVars( path, &textResolver, nullptr, &Prj() );

pcbnew/dialogs/dialog_plot.cpp

@@ -461,7 +461,15 @@ void DIALOG_PLOT::OnSetScaleOpt( wxCommandEvent& event )
 void DIALOG_PLOT::OnOutputDirectoryBrowseClicked( wxCommandEvent& event )
 {
     // Build the absolute path of current output directory to preselect it in the file browser.
-    wxString path = ExpandEnvVarSubstitutions( m_outputDirectoryName->GetValue(), &Prj() );
+    std::function<bool( wxString* )> textResolver =
+            [&]( wxString* token ) -> bool
+            {
+                return m_parent->GetBoard()->ResolveTextVar( token, 0 );
+            };
+
+    wxString path = m_outputDirectoryName->GetValue();
+    path = ExpandTextVars( path, &textResolver, nullptr, &Prj() );
+    path = ExpandEnvVarSubstitutions( path, &Prj() );
     path = Prj().AbsolutePath( path );
 
     wxDirDialog dirDialog( this, _( "Select Output Directory" ), path );