Normalize node heights in dbtree and all other virtual trees, make them slightly less high. Keeping 120 DPI compatibility for editing boxes.

Cosmetic todo: Fix Vista selection colors and tree collapse/expand buttons

source/childwin.dfm

@@ -66,12 +66,10 @@ object MDIChild: TMDIChild
       Images = MainForm.PngImageListMain
       IncrementalSearch = isInitializedOnly
       Indent = 16
-      Margin = 2
       ParentShowHint = False
       PopupMenu = popupTreeView
       ShowHint = True
       TabOrder = 0
-      TextMargin = 2
       TreeOptions.AutoOptions = [toAutoDropExpand, toAutoTristateTracking, toAutoDeleteMovedNodes]
       TreeOptions.PaintOptions = [toHotTrack, toShowButtons, toShowDropmark, toShowTreeLines, toThemeAware, toUseBlendedImages]
       TreeOptions.SelectionOptions = [toRightClickSelect]

source/helpers.pas

@@ -2630,7 +2630,7 @@ begin
   // Vist font fix: VT.Header doesn't have a ParentFont property, so we apply the font manually
   InheritFont(VT.Header.Font);
   // Resize hardcoded node height to work with different DPI settings
-  newHeight := VT.Canvas.TextHeight('A') + VT.TextMargin*2;
+  newHeight := VT.Canvas.TextHeight('A') + 6;
   VT.DefaultNodeHeight := newHeight;
   VT.Header.Height := newHeight;
 end;