Apply Scintilla hack to get auto-sizing canvas.

Fixes https://gitlab.com/kicad/code/kicad/issues/4207

eeschema/dialogs/dialog_edit_label.cpp

@@ -117,7 +117,11 @@ DIALOG_LABEL_EDITOR::DIALOG_LABEL_EDITOR( SCH_EDIT_FRAME* aParent, SCH_TEXT* aTe
     }
 
     m_valueMultiLine->SetEOLMode( wxSTC_EOL_LF );
-    m_valueMultiLine->SetUseHorizontalScrollBar( false );
+
+    // A hack which causes Scintilla to auto-size the text editor canvas
+    // See: https://github.com/jacobslusser/ScintillaNET/issues/216
+    m_valueMultiLine->SetScrollWidth( 1 );
+    m_valueMultiLine->SetScrollWidthTracking( true );
 
     if( m_CurrentText->IsMultilineAllowed() )
     {
@@ -146,8 +150,10 @@ DIALOG_LABEL_EDITOR::DIALOG_LABEL_EDITOR( SCH_EDIT_FRAME* aParent, SCH_TEXT* aTe
         m_activeTextCtrl = m_valueSingleLine;
         m_activeTextEntry = m_valueSingleLine;
 
-        m_labelCombo->Show( false );       m_valueCombo->Show( false );
-        m_labelMultiLine->Show( false );   m_valueMultiLine->Show( false );
+        m_labelCombo->Show( false );
+        m_valueCombo->Show( false );
+        m_labelMultiLine->Show( false );
+        m_valueMultiLine->Show( false );
 
         if( m_CurrentText->Type() != SCH_TEXT_T )
             m_valueSingleLine->SetValidator( m_netNameValidator );

pcbnew/dialogs/dialog_edit_footprint_for_BoardEditor_base.cpp

@@ -445,7 +445,7 @@ DIALOG_FOOTPRINT_BOARD_EDITOR_BASE::DIALOG_FOOTPRINT_BOARD_EDITOR_BASE( wxWindow
 
 	// Cell Defaults
 	m_modelsGrid->SetDefaultCellAlignment( wxALIGN_LEFT, wxALIGN_TOP );
-	m_modelsGrid->SetMinSize( wxSize( -1,86 ) );
+	m_modelsGrid->SetMinSize( wxSize( -1,56 ) );
 
 	sbSizer3->Add( m_modelsGrid, 1, wxEXPAND|wxRIGHT, 5 );
 

pcbnew/dialogs/dialog_edit_footprint_for_BoardEditor_base.fbp

@@ -3653,7 +3653,7 @@
                                                     <property name="maximum_size"></property>
                                                     <property name="min_size"></property>
                                                     <property name="minimize_button">0</property>
-                                                    <property name="minimum_size">-1,86</property>
+                                                    <property name="minimum_size">-1,56</property>
                                                     <property name="moveable">1</property>
                                                     <property name="name">m_modelsGrid</property>
                                                     <property name="pane_border">1</property>

pcbnew/dialogs/dialog_text_properties.cpp

@@ -60,7 +60,11 @@ DIALOG_TEXT_PROPERTIES::DIALOG_TEXT_PROPERTIES( PCB_BASE_EDIT_FRAME* aParent, BO
     wxString title;
 
     m_MultiLineText->SetEOLMode( wxSTC_EOL_LF );
-    m_MultiLineText->SetUseHorizontalScrollBar( false );
+
+    // A hack which causes Scintilla to auto-size the text editor canvas
+    // See: https://github.com/jacobslusser/ScintillaNET/issues/216
+    m_MultiLineText->SetScrollWidth( 1 );
+    m_MultiLineText->SetScrollWidthTracking( true );
 
     m_linesThickness.Show( m_item->Type() == PCB_DIMENSION_T );