[X6M-Work]

Fixes #8053.

Problem

With make_subplots(rows=2, cols=2, shared_xaxes=True, shared_yaxes=True) and a range set on the x axes, the y axes stop autoranging and show [-1, 4]. The layout from the issue boils down to four match groups, {x, x3} and {x2, x4} with a range, then {y, y2} and {y3, y4} without one:

xaxis:  {range: [0, 100], matches: 'x3'},  yaxis:  {},
xaxis2: {range: [0, 100], matches: 'x4'},  yaxis2: {matches: 'y'},
xaxis3: {range: [0, 100]},                 yaxis3: {},
xaxis4: {range: [0, 100]},                 yaxis4: {matches: 'y3'}

Cause

In constraints.handleDefaults, hasRange is declared once, before the loop over match groups, and never reset. After the first x group sets it, every later group with no explicit autorange gets autorange: false. The y axes then have no range and fall back to the default one. It needs at least two match groups, which is why the issue only shows up with more than one row and more than one column.

Resetting hasRange for each group exposed a second problem, caught by the existing should match set axis range value for matching axes test. The explicit-range check ran after the loop and read axIn, which is the last axis visited, not the axis the range came from. For the {x3, y3} group in that test, the range comes from yaxis3, but the loop ends on xaxis3, which has none. The test only passed because hasRange leaked in from the {y, y2} group processed before it.

Changes

• Reset hasRange at the start of each match group.
• Set hasRange in setAttrVal, from the input of the axis that supplies the range, with the same validity check as before.

Tests

New axes_test.js case using the layout above: the x axes keep autorange: false and the y axes get autorange: true. It fails on main (Expected false to be true, 'yaxis', same for yaxis2-yaxis4).

Locally (Windows 11, Chrome 156):

• axes_test.js: 407 passed, 2 failed. The 2 failures (insiderange relayout, insiderange react to new data) also fail on main here, off by a few pixels.
• cartesian_test.js, cartesian_interact_test.js, splom_test.js, range_slider_test.js, plot_api_react_test.js: the same 12 drag, map and WebGL tests fail with and without this change, and the rest pass.
• biome lint passes on the changed files.

I didn't run the image baseline tests.