[Fixed Bugs and Problems]

• Fixed a bug where drawing lines by some brush with "Separate Each Stroke" OFF and by some eraser with "Separate Each Stroke" OFF alternately breaks the content of the canvas.
• Fixed a bug where changing the opacity while using some eraser with "Separate Each Stroke" OFF changes not only the opacity of the Eraser tool but also that of the Brush tool.
• Fixed a bug where launching and canceling the Filter tool after drawing lines with some brush whose "Separate Each Stroke" is OFF and blending mode is something other than "Normal" breaks the content of the canvas.
• Fixed a bug where launching and canceling the Filter tool after drawing lines with some eraser whose "Separate Each Stroke" is OFF breaks the content of the canvas.