Consider parent rules if ignore rule is negated

The change tries to make jgit behave more like native CLI git regarding
the negation rules. According to [1] "... prefix "!" which negates the
pattern; any matching file excluded by a previous pattern will become
included again." Negating the pattern should not automatically make the
file *not ignored* - other pattern rules have to be considered too.

The fix adds test cases for both bugs 448094 and 407475.

[1] https://www.kernel.org/pub/software/scm/git/docs/gitignore.html

Bug: 448094
Bug: 407475
Change-Id: I322954200dd3c683e3d8f4adc48506eb99e56ae1
Signed-off-by: Andrey Loskutov <loskutov@gmx.de>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
Use baseline instead of centerline in PlotRenderer

If the text extent height of a to be rendered plot line is odd, then the
SWTPlotRenderer cannot calculate the correct Y position for drawing the
label and draws the label with a 1 pixel offset. SWT text drawing uses
the baseline as Y coordinate. Due to the given centerline API in the
AbstractPlotRenderer the overall calculation of the baseline for SWT is
effectively (height / 2) * 2, thereby rounding all odd heights downward
to the next even number.

This change pushes the division by 2 from the caller into the
implementations of drawText. A corresponding change will be pushed in
the egit repository.

Bug: 450813
Change-Id: I66f4e71873bb8e6f936fde573bbe4c35fe23a022
Signed-off-by: Michael Keppler <michael.keppler@gmx.de>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>