problem rendering last row of pixels on composer with map item extending to the full width & height of sheet

[qgib]

Author Name: Mathieu Pellerin - nIRV (Mathieu Pellerin - nIRV)
Original Redmine Issue: 10095
Affected QGIS version: 2.2.0
Redmine category:map_composer/printing

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Steps to reproduce:

1. Create an empty project
2. Change the project's background color to black
3. Create a composer
4. Add a map item and make sure its background color is black (it should be by default)
5. Extend the map item's height and width to fully cover the map sheet
6. Export the sheet to a PNG image
7. Open the exported PNG image with Gimp, or Photoshop, and zoom in until pixels are large blocks and go to the very bottom of the image, you'll notice a non-black line at the very bottom (light gray)

That's a problem that can be irritating when exporting maps, see attached example (last line is white, it shouldn't be)

[qgib]

Author Name: Mathieu Pellerin - nIRV (Mathieu Pellerin - nIRV)

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• 7140 removed one_more.png

[qgib]

Author Name: Mathieu Pellerin - nIRV (Mathieu Pellerin - nIRV)

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Whoops, wrong photo. Here it is: http://i.imgur.com/v6Jlci9.jpg

[qgib]

Author Name: Jürgen Fischer (@jef-n)

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• category_id was configured as Map Composer/Printing

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• regression was configured as 0
• easy_fix was configured as 0

[qgib]

Author Name: Giovanni Manghi (@gioman)

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End of life notice: QGIS 2.18 LTR

Source:
http://blog.qgis.org/2019/03/09/end-of-life-notice-qgis-2-18-ltr/

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• resolution was changed from to end of life
• status_id was changed from Open to Closed