[rtags] Allow to 'derive' rtags
Since some releases, rtags (structure underlying uicfg) have selector and may be
copied using something like:
new_rtags = deepcopy(original_rtags)
new_rtags.__module__ = __name__
new_rtags.__select__ = custom_selector
The problem is that starting from that, both rtags wil diverge and changes in
original_rtags won't be considered, while we usually want to set a few specific
rules only in new_rtags. To fix this problem, this cset introduces the notion of
"derivated/parent" rtag, eg:
new_rtags = original_rtags.derive(__name__, custom_selector)
Beside easier copying, when using the above method changes in original_rtags
which are not overriden by new_rtags will be considered since it only hold its
specific rules but look among its parent chain for non-found keys.
Along the way, flake8 unittest_rtags.
Closes #16164880
table.tree {
border-collapse: collapse;
}
table.tree td {
padding: 0px;
}
div.tree_cell {
border: 1px solid black;
margin-top: 2px;
margin-bottom: 2px;
margin-left: 0px;
margin-right: 0px;
padding-top: 2px;
padding-bottom: 2px;
padding-left: 5px;
padding-right: 5px;
}
div.selected {
border: 2px solid black;
background-color: #ccc;
}
table.tree td.tree_cell {
padding: 0px;
}
table.tree td.tree_cell_1_1,
td.tree_cell_1_2 {
border-bottom: 1px solid black;
}
table.tree td.tree_cell_1_3 {
border-right: 1px solid black;
}
table.tree td.tree_cell_1_4 {
border: 0px;
}
table.tree td.tree_cell_2_1,
td.tree_cell_2_3 {
border-right: 1px solid black;
}
table.tree td.tree_cell_2_2,
td.tree_cell_2_4 {
border: 0px;
}
table.tree td.tree_cell_3_1,
td.tree_cell_3_3 {
border-right: 1px solid black;
}
table.tree td.tree_cell_3_2 {
border-bottom: 1px solid black;
}
table.tree td.tree_cell_3_4 {
border: 0px;
}
table.tree td.tree_cell_4_1 {
border-right: 1px solid black;
}
table.tree td.tree_cell_4_2 {
border-bottom: 1px solid black;
}
table.tree td.tree_cell_4_3,
td.tree_cell_4_4 {
border: 0px;
}
table.tree td.tree_cell_5_1,
td.tree_cell_5_2 {
border-bottom: 1px solid black;
}
table.tree td.tree_cell_5_3,
td.tree_cell_5_4 {
border: 0px;
}
table.tree td.tree_cell_0_1,
td.tree_cell_0_2,
td.tree_cell_0_3,
td.tree_cell_0_4 {
border: 0px;
}