Don't select all of textfield on each focus.

GTK (at least) generates focus events when the app is reactivated so
the text keeps getting re-selected.

Fixes https://gitlab.com/kicad/code/kicad/issues/6757

eeschema/dialogs/dialog_edit_one_field.cpp

@@ -46,6 +46,7 @@ DIALOG_EDIT_ONE_FIELD::DIALOG_EDIT_ONE_FIELD( SCH_BASE_FRAME* aParent, const wxS
     m_posX( aParent, m_xPosLabel, m_xPosCtrl, m_xPosUnits, true ),
     m_posY( aParent, m_yPosLabel, m_yPosCtrl, m_yPosUnits, true ),
     m_textSize( aParent, m_textSizeLabel, m_textSizeCtrl, m_textSizeUnits, true ),
+    m_firstFocus( true ),
     m_scintillaTricks( nullptr )
 {
     wxASSERT( aTextItem );
@@ -165,6 +166,8 @@ void DIALOG_EDIT_ONE_FIELD::OnTextValueSelectButtonClick( wxCommandEvent& aEvent
 
 
 void DIALOG_EDIT_ONE_FIELD::OnSetFocusText( wxFocusEvent& event )
+{
+    if( m_firstFocus )
     {
 #ifdef __WXGTK__
         // Force an update of the text control before setting the text selection
@@ -182,6 +185,9 @@ void DIALOG_EDIT_ONE_FIELD::OnSetFocusText( wxFocusEvent& event )
         else if( m_fieldId == VALUE_FIELD || m_fieldId == SHEETNAME_V )
             m_TextCtrl->SetSelection( -1, -1 );
 
+        m_firstFocus = false;
+    }
+
     event.Skip();
 }
 

eeschema/dialogs/dialog_edit_one_field.h

@@ -102,6 +102,8 @@ protected:
     int         m_horizontalJustification;
     bool        m_isVisible;
 
+    bool        m_firstFocus;
+
     SCINTILLA_TRICKS* m_scintillaTricks;
 };