Tracker: Call AdoptSystemColors() to apply read-only tint

2 - 1.147 = 0.853

Change-Id: I260af9d07f5e43e939ce351bfd4036665ad126f4
Reviewed-on: https://review.haiku-os.org/c/haiku/+/8269
Haiku-Format: Haiku-format Bot <[email protected]>
Reviewed-by: waddlesplash <[email protected]>
Tested-by: Commit checker robot <[email protected]>

src/kits/tracker/TextWidget.cpp

@@ -456,13 +456,12 @@ BTextWidget::StartEdit(BRect bounds, BPoseView* view, BPose* pose)
 	textView->AddFilter(new BMessageFilter(B_KEY_DOWN, TextViewKeyDownFilter));
 
 	if (view->SelectedVolumeIsReadOnly()) {
+		textView->AdoptSystemColors();
 		textView->MakeEditable(false);
 		textView->MakeSelectable(true);
-		// tint text view background color to indicate not editable
-		textView->SetViewColor(tint_color(textView->ViewColor(),
-			ReadOnlyTint(textView->ViewColor())));
-	} else
+	} else {
 		textView->AddFilter(new BMessageFilter(B_PASTE, TextViewPasteFilter));
+	}
 
 	// get full text length
 	rect.right = rect.left + textView->LineWidth();

src/kits/tracker/Utilities.cpp

@@ -91,7 +91,7 @@ float
 ReadOnlyTint(rgb_color base)
 {
 	// darken tint if read-only (or lighten if dark)
-	return base.IsLight() ? B_DARKEN_1_TINT : 0.85;
+	return base.IsLight() ? B_DARKEN_1_TINT : 0.853;
 }