Filter line-endings from single-line Scintilla editors.

Fixes https://gitlab.com/kicad/code/kicad/-/issues/15793

common/scintilla_tricks.cpp

@@ -54,6 +54,12 @@ SCINTILLA_TRICKS::SCINTILLA_TRICKS( wxStyledTextCtrl* aScintilla, const wxString
     m_te->SetScrollWidth( 1 );
     m_te->SetScrollWidthTracking( true );
 
+    if( m_singleLine )
+    {
+        m_te->SetUseVerticalScrollBar( false );
+        m_te->SetUseHorizontalScrollBar( false );
+    }
+
     setupStyles();
 
     // Set up autocomplete
@@ -65,6 +71,7 @@ SCINTILLA_TRICKS::SCINTILLA_TRICKS( wxStyledTextCtrl* aScintilla, const wxString
 
     // Hook up events
     m_te->Bind( wxEVT_STC_UPDATEUI, &SCINTILLA_TRICKS::onScintillaUpdateUI, this );
+    m_te->Bind( wxEVT_STC_MODIFIED, &SCINTILLA_TRICKS::onModified, this );
 
     // Handle autocomplete
     m_te->Bind( wxEVT_STC_CHARADDED, &SCINTILLA_TRICKS::onChar, this );
@@ -170,6 +177,31 @@ void SCINTILLA_TRICKS::onChar( wxStyledTextEvent& aEvent )
 }
 
 
+void SCINTILLA_TRICKS::onModified( wxStyledTextEvent& aEvent )
+{
+    if( m_singleLine )
+    {
+        wxString text = m_te->GetText();
+
+        if( text.Contains( wxS( "\n" ) ) || text.Contains( wxS( "\r" ) ) )
+        {
+            // Scintilla won't allow us to call SetText() from within this event processor,
+            // so we have to delay the processing.
+            CallAfter( [this]()
+                       {
+                           wxString text = m_te->GetText();
+                           int currpos = m_te->GetCurrentPos();
+
+                           text.Replace( wxS( "\n" ), wxS( "" ) );
+                           text.Replace( wxS( "\r" ), wxS( "" ) );
+                           m_te->SetText( text );
+                           m_te->GotoPos( currpos-1 );
+                       } );
+        }
+    }
+}
+
+
 void SCINTILLA_TRICKS::onCharHook( wxKeyEvent& aEvent )
 {
     wxString c = aEvent.GetUnicodeKey();
@@ -267,6 +299,13 @@ void SCINTILLA_TRICKS::onCharHook( wxKeyEvent& aEvent )
                 str = data.GetText();
 
                 ConvertSmartQuotesAndDashes( &str );
+
+                if( m_singleLine )
+                {
+                    str.Replace( wxS( "\n" ), wxEmptyString );
+                    str.Replace( wxS( "\r" ), wxEmptyString );
+                }
+
                 m_te->BeginUndoAction();
                 m_te->AddText( str );
                 m_te->EndUndoAction();

eeschema/dialogs/dialog_field_properties.cpp

@@ -160,15 +160,13 @@ void DIALOG_FIELD_PROPERTIES::init()
     m_CommonConvert->Show( false );
     m_CommonUnit->Show( false );
 
-    // Predefined fields cannot contain some chars, or cannot be empty,
-    // and need a SCH_FIELD_VALIDATOR (m_StyledTextCtrl cannot use a SCH_FIELD_VALIDATOR).
-    bool use_validator = m_fieldId == REFERENCE_FIELD
-                         || m_fieldId == FOOTPRINT_FIELD
-                         || m_fieldId == DATASHEET_FIELD
-                         || m_fieldId == SHEETNAME_V
-                         || m_fieldId == SHEETFILENAME_V;
-
-    if( use_validator )
+    // Predefined fields cannot contain some chars and cannot be empty, so they need a
+    // SCH_FIELD_VALIDATOR (m_StyledTextCtrl cannot use a SCH_FIELD_VALIDATOR).
+    if( m_fieldId == REFERENCE_FIELD
+            || m_fieldId == FOOTPRINT_FIELD
+            || m_fieldId == DATASHEET_FIELD
+            || m_fieldId == SHEETNAME_V
+            || m_fieldId == SHEETFILENAME_V )
     {
         m_TextCtrl->SetValidator( FIELD_VALIDATOR( m_fieldId, &m_text ) );
         SetInitialFocus( m_TextCtrl );
@@ -190,9 +188,8 @@ void DIALOG_FIELD_PROPERTIES::init()
 
     GetSizer()->SetSizeHints( this );
 
-    // Adjust the height of the scintilla text editor after the first layout
-    // To show only one line
-    // (multiline text are is supported in fields and will be removed)
+    // Adjust the height of the scintilla editor after the first layout to show a single line
+    // (multiline text is not supported in fields and will be removed)
     if( m_StyledTextCtrl->IsShown() )
     {
         wxSize maxSize = m_StyledTextCtrl->GetSize();

eeschema/sch_field.cpp

@@ -677,10 +677,7 @@ void SCH_FIELD::OnScintillaCharAdded( SCINTILLA_TRICKS* aScintillaTricks,
     int           start = scintilla->WordStartPosition( pos, true );
     wxString      partial;
 
-    // Currently, '\n' is not allowed in fields. So remove it when entered
-    // TODO: see if we must close the dialog. However this is not obvious, as
-    // if a \n is typed (and removed) when a text is selected, this text is deleted
-    // (in fact replaced by \n, that is removed by the filter)
+    // Multi-line fields are not allowed. So remove '\n' if entered.
     if( key == '\n' )
     {
         wxString text = scintilla->GetText();

include/scintilla_tricks.h

@@ -1,7 +1,7 @@
 /*
  * This program source code file is part of KiCad, a free EDA CAD application.
  *
- * Copyright (C) 2020-2022 KiCad Developers, see change_log.txt for contributors.
+ * Copyright (C) 2020-2023 KiCad Developers, see change_log.txt for contributors.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -60,6 +60,7 @@ protected:
 
     void onCharHook( wxKeyEvent& aEvent );
     void onChar( wxStyledTextEvent& aEvent );
+    void onModified( wxStyledTextEvent& aEvent );
     void onScintillaUpdateUI( wxStyledTextEvent& aEvent );
     void onThemeChanged( wxSysColourChangedEvent &aEvent );