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LibGUI: Fix crash when previewing palette images
For example, navigating File Manager to a directory that contains a vaild BMP file that uses a palette, this code would end up trying to create an indexed thumbnail. However, Painter asserts that the thumbnail that we paint on is *not* indexed, usually crashing File Manager. Partially fixes #5299, as it now crashes somewhere else.
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@ -497,7 +497,7 @@ static RefPtr<Gfx::Bitmap> render_thumbnail(const StringView& path)
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double scale = min(32 / (double)png_bitmap->width(), 32 / (double)png_bitmap->height());
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auto thumbnail = Gfx::Bitmap::create(png_bitmap->format(), { 32, 32 });
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auto thumbnail = Gfx::Bitmap::create(Gfx::BitmapFormat::RGBA32, { 32, 32 });
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Gfx::IntRect destination = Gfx::IntRect(0, 0, (int)(png_bitmap->width() * scale), (int)(png_bitmap->height() * scale));
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destination.center_within(thumbnail->rect());
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