Fixed incorrect inactive titlebar color for Windows & Linux

Author: Stefterv

app/src/main/resources/processing/app/laf/FlatLaf.properties

@@ -0,0 +1,23 @@
+# The default is 8, which creates tiny nubby scroll bars
+ScrollBar.width = 16
+
+TitlePane.inactiveForeground = #000000
+
+
+# Better matched for macOS dark mode (but using everywhere)
+# https://github.com/JFormDesigner/FlatLaf/issues/497
+
+[dark]@background = #1e1e1e
+[dark]@foreground = #e0e0e0
+[dark]@accentColor = #107aff
+[dark]@accentFocusColor = #176896
+
+[dark]Component.arrowType = chevron
+
+[dark]CheckBox.icon.style = filled
+[dark]CheckBox.icon[filled].selectedBorderColor = @accentColor
+[dark]CheckBox.icon[filled].selectedBackground = @accentColor
+[dark]CheckBox.icon[filled].checkmarkColor = @foreground
+
+[dark]RadioButton.icon.style = filled
+[dark]RadioButton.icon[filled].centerDiameter = 6