gtk - GtkScrolledWindow container sends its child a size allocation with a negative coordinate -


i'm porting custom gtk+ widget gtk2 gtk3, , i'm observing latter, i'm getting size_allocation calls parent widget (a gtkscrolledwindow) have allocation negative y coordinate.

this causes widget freak out , stupid things obviously. if ignore calls contain negative coordinates, seems work fine.

so questions are:

  • is gtk bug?
  • if not, in circumstances should parent send negative coordinates?
  • why happen in gtk3 not gtk2?

it happens both gtk+ 3.6.4 (the 1 comes in ubuntu 13.04) , 3.8 (ubuntu 13.10). test higher version soon.

it turns out problem how widget modifying gtkadjustment values, required implement scrollable ginterface.

it seems come fact gtk3 appears more "liberal" in accepting weird values. read whole story in the commit message of bugfix (open source, yeah!).


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