Paint.NET 4.0 Beta 4

The following changes have been made in this version of Paint.Net:
- The Line/Curve tool is now back, and the Line and Curve shapes have been removed from the Shapes tool
- Improved rendering quality of the Line/Curve tool, especially when antialiasing is disabled
- Rectangle and Rounded Rectangles shapes now draw using an "inset" brush stroke. This helps prevents blurriness with odd-sized brush widths
- Shapes tool now lets you commit by clicking outside of the bounding box of the current shape. (you can also start drawing a new shape via clicking and dragging, of course)
- Improved rendering quality of brush tools when antialiasing is disabled
- Improved performance of Shapes and Line/Curve tools on most systems (e.g., less than 8 CPU cores)
- Improved rendering quality of Image->Resize when using Nearest Neighbor
- Fixed the Palette chooser in the Colors window, which was going away when you tried to move the mouse to click on one of its items
- Fixed some broken clipping when using Paste and "Expand Canvas"
- Intel-based GPUs now default to having hardware acceleration disabled. You may still force it to be enabled from the Settings dialog.
- When pasting, the PNG format now has a higher priority than CF_DIB, which allows easier access to transparency (alpha) from other applications
- Tools no longer incorrectly commit when clicking on the currently active layer in the Layers window
- The layer's opacity was being ignored while drawing if it was the lowest (index zero) layer
- You can now copy a file from File Explorer and Paste it into Paint.NET (regression from 3.5)
- Fixed the canvas scroll bars occasionally being incorrect after maximizing the main window and then restoring it
- Fixed radio button group tab processing
- Fixed many small miscellaneous crashes
- New language: Czech