GeezerVison

The columns of the Browse Data tab are sized to their contents once when a
table is opened, and a single column can be resized by double-clicking its
header separator, but there was no way to fit all columns again after the
data or the window had changed. Add a 'Resize columns to contents' entry to
the column header context menu for that.

The resize-and-cap logic that used to live in TableBrowser::fetchedData is
moved to ExtendedTableWidget::fitColumnsToContents, which is shared by the
automatic and the manual resize and is covered by a new offscreen test.
Hidden columns are left alone and the existing 300 pixel cap is kept.

See sqlitebrowser#2351

The height of the rows in the data browser and in the SQL results is the
height of the data browser font plus a hard-coded 10 pixels, so there was no
way to see more rows on the screen except for making the font smaller. Add
a 'Row padding (px)' option to the Data Browser tab of the preferences. Its
default of 10 keeps the current row height.

Qt does not let the default section size of a header become lower than its
minimum section size, which by default depends on the font of the row
header and not on the font of the data. Set the minimum to the height of a
line of text so that low padding values take effect.

See sqlitebrowser#419