D14103: Add mouse shortcut for Fill and adapt docbook

[Peter Mühlenpfordt]

muhlenpfordt added a comment.


  In D14103#292352 <https://phabricator.kde.org/D14103#292352>, @rkflx wrote:
  
  > In D14103#292346 <https://phabricator.kde.org/D14103#292346>, @muhlenpfordt wrote:
  >
  > > Sadly the centering to mouse position when zooming to 100% gets lost with our combination.
  >
  >
  > Interesting. Is this really working for you without the patches? For me, even middle-clicking with a KDE4-based Gwenview centers instead of respecting the mouse position.
  
  
  I never saw it **not** working. No matter what Kubuntu version I used, up to 18.04 (Frameworks 5.44 / Qt 5.9.5).
  
  > I think it would be great to get this working for both clicking and the keyboard shortcuts, see my comment in D14093#291581 <https://phabricator.kde.org/D14093#291581>. (I'm not sure how well this will work for the shortcut case when the cursor is outside the viewport. If it is confusing maybe in that case there could be a fallback to the center, but let's try without the fallback first.)
  
  It's not easy to map the current mouse position from global `QCursor::pos()` in a `QGraphicsWidget`.
  But finally found a way in the Qt source <http://code.qt.io/cgit/qt/qtbase.git/tree/src/widgets/graphicsview/qgraphicsitem.cpp?h=dev#n2320>. :)

REPOSITORY
  R260 Gwenview

REVISION DETAIL
  https://phabricator.kde.org/D14103

To: rkflx, #gwenview
Cc: muhlenpfordt, kde-doc-english, skadinna
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