When restoring the plot state we always checked set the use-on-y-axis
checkbox when a colour was defined for a field. This is correct most of
the times because a field doesn't have a colour as long as it's not used
in the plot. However, when you uncheck a field it keeps its colour which
starts causing issues as soon these settings are reloaded.
The solution is to not only store the colour but also the check state
independently. This changes the project files format though, so the code
needs to support loading old and new file formats.
See issue #1245.
The Column Field is resized to the content.
The dummy column has been removed and the header no longer stretches the
last section property.
The table has alternating row colors for easy following of the field
checks.
The user is now able of selecting a range of contiguous points in any of
the graphs of the plot, through rectangle selection or click in single
point. This selection triggers automatically the selection of the
corresponding lines in the browsed table. In this way the user can analyse
the plot in detail.
Two other minor improvements: spelling error fixed and the dummy column in
the plot selection table has now transparent foreground (intends to avoid
wondering of the user about what functionality provides this column).
This cleans up the main window class a bit which was getting quite large
and a bit harder to maintain than necessary.
This commit also includes two minor fixes to the plot system:
- The plot widgets are now disabled when no database file is opened.
- The progress bar shown when fetching all data is now initialised with
the correct row numbers.
Other than that this commit should in theory not change any
functionality.
