(svn r12869) [0.6] -Backport from trunk r12714, r12708, r12674, r12577, r12553:

- Fix: Do not move windows below the toolbar on resizes unless they would go behind the toolbar [FS#1904] (r12714)
- Fix: Increase default sound buffer size only for Vista [FS#1914] (r12708)
- Fix: Colour remaps on station sprites only worked for company colours [FS#1902] (r12674)
- Fix: The convert signal button disallowed signal dragging when the signal GUI was closed (r12577)
- Fix: Redraw the signal GUI when the signal drag density changes in the patch settings and vice versa (r12553)

src/settings.cpp

@@ -1206,6 +1206,15 @@ static int32 RealisticAccelerationChanged(int32 p1)
 	return 0;
 }
 
+static int32 DragSignalsDensityChanged(int32)
+{
+	const Window *w = FindWindowById(WC_BUILD_SIGNAL, 0);
+
+	if (w != NULL) SetWindowDirty(w);
+
+	return 0;
+}
+
 /**
  * Check for right TownLayout usage in editor mode.
  * The No Road mode is not desirable since towns have to be
@@ -1400,7 +1409,7 @@ const SettingDesc _patch_settings[] = {
 	SDT_BOOL(Patches, signal_side,                   N,NN,  true,        STR_CONFIG_PATCHES_SIGNALSIDE,          RedrawScreen),
 	SDT_BOOL(Patches, always_small_airport,          0,NN, false,        STR_CONFIG_PATCHES_SMALL_AIRPORTS,      NULL),
 	SDT_BOOL(Patches, enable_signal_gui,             S, 0, false,        STR_CONFIG_PATCHES_ENABLE_SIGNAL_GUI,   NULL),
-	 SDT_VAR(Patches, drag_signals_density,SLE_UINT8,S, 0,  4, 1, 20, 0, STR_CONFIG_PATCHES_DRAG_SIGNALS_DENSITY,NULL),
+	 SDT_VAR(Patches, drag_signals_density,SLE_UINT8,S, 0,  4, 1, 20, 0, STR_CONFIG_PATCHES_DRAG_SIGNALS_DENSITY,DragSignalsDensityChanged),
 	 SDT_VAR(Patches, semaphore_build_before,SLE_INT32, S, NC, 1975, MIN_YEAR, MAX_YEAR, 1, STR_CONFIG_PATCHES_SEMAPHORE_BUILD_BEFORE_DATE, NULL),
 	SDT_CONDVAR(Patches, town_layout, SLE_UINT8, 59, SL_MAX_VERSION, 0, MS, TL_ORIGINAL, TL_NO_ROADS, NUM_TLS - 1, 1, STR_CONFIG_PATCHES_TOWN_LAYOUT, CheckTownLayout),