Paint.NET 4.0.17 Beta 6404
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Fixed very slow performance opening the Effects menu when lots of plugins are installed after installing the Windows 10 Creators Update.
Fixed: Gradient tool no longer applies dithering "outside" of the gradient (in areas that should have a solid color).
Added: "Fluid mouse input" option in Settings -> UI -> Troubleshooting. If you see major glitches while drawing, try disabling this.
Fixed: When cropping and then performing an undo, the scroll position was totally wrong.
Fixed a rendering glitch in the Save Configuration dialog (things would "wiggle").
Improved: Default brush size, font size, and corner radius size now scales with major DPI scaling levels (brush size of 2 at 100% scaling, brush size of 4 at 200% scaling, etc).
Improved: Default image size now scales with major DPI scaling levels (800x600 at 100%, 1600x1200 at 200%, etc.).
Improved: Removed "hold Ctrl to hide handle" from the Text tool because it was not useful and caused lots of confusion.
Improved performance and drawing latency by removing explicit calls to System.GC.Collect() except when low memory conditions are encountered.
Improved performance by greatly reducing object allocation amplification by reducing the concurrency level when using ConcurrentDictionary, and by removing WeakReference allocations in favor of direct GCHandle usage.
Improved (reduced) CPU usage when moving the mouse around the canvas.
Fixed: At certain brush sizes, the brush indicator on the canvas had a visual glitch in it due to a bug in Direct2D.
Fixed: Text tool buttons for Bold, Italics, Underline were not localized for a few languages.
Fixed: Various high-DPI fixes, including horrible looking mouse cursors caused by a bug in the latest .NET WinForms update.
Fixed a rare crash in the taskbar thumbnails.
Fixed: Drawing with an aliased brush and opaque color (alpha=255) sometimes resulted in non-opaque pixels due to a bug in Direct2D's ID2D1RenderTarget::FillOpacityMask.
Fixed: "Olden" effect should no longer cause crashes (it still has some rendering artifacts due to its multithreading problems, however).
New: Portable mode can be enabled via a setting in the .exe.config, which will redirect app settings into a local JSON file (see blog/forum post for details).