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Fix broken changes of wheel mouse. Sorry !
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@5460 a592a061-630c-0410-9148-cb99ea01b6c8
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@ -393,11 +393,12 @@ void BufferView::Pimpl::scroll(int lines)
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LyXText const * t = bv_->text;
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int const line_height = t->defaultHeight();
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int const disp = lines * line_height;
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// The new absolute coordinate
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int new_first_y = t->first_y + lines * line_height;
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// Restrict to a valid value
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int new_first_y = std::min(t->height - 4 * line_height, disp);
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new_first_y = std::max(0, disp);
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new_first_y = std::min(t->height - 4 * line_height, new_first_y);
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new_first_y = std::max(0, new_first_y);
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scrollDocView(new_first_y);
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