Fix glitch on mouse-wheel zoom event

[strk]

See http://hub.qgis.org/issues/11811

[nirvn]

The person to consult here is @wonder-sk . I haven't tested the proposed fix but what should not happen is for the pre-rendering temporary paint to be removed. On slow computers it really enhance the user experience.

[strk]

pre-rendering paint is not removed by the change

[strk]

Travis fails against an unrelated test which is also failing in master as of d84af0d:

FAIL! : TestZipLayer::testZipItemRaster() 'testZipItem( QDir::tempPath() + "/testzip.zip", "landsat_b1.tif" )' returned FALSE. ()

@blazek your commit was first failing, ideas ? Need a separate ticket for that ? See https://travis-ci.org/qgis/QGIS/builds/43823913

[strk]

Pushed as 40e0d78

[strk]

NOTE: the fix was reverted as it broke proper rendering of rotated map. It really needs be done at the renderer side, to always pass a properly clipped image to setRect. That way it should work. I'll file another PR when ready with that approach (next week)

[blazek]

TestZipLayer is fixed in 69b27f0

[NathanW2]

Sandro please don't push and then revert commits without reviews.

On Sat, 13 Dec 2014 5:06 am Radim Blazek notifications@github.com wrote:

TestZipLayer is fixed in 69b27f0
69b27f0

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#1732 (comment).

[strk]

Sorry @NathanW2 I'll keep next PR for this open for review and avoid pushing it myself.

[strk]

Next PR is here: #1734