D774: Add zoom buttons to documentation view and make it able to zoom documentation using Ctrl + mouse wheel

[Sergey Popov]

Sergobot abandoned this revision.

REPOSITORY
  R33 KDevPlatform

REVISION DETAIL
  https://phabricator.kde.org/D774

To: Sergobot, mwolff, kfunk
Cc: rjvbb, mwolff, apol, kdevelop-devel, glebaccon, hase, antismap, iodelay, geetamc, Pilzschaf, akshaydeo, surgenight, arrowd
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