Add a standalone fixture using the real topology renderer and styles.
Check painted pixels in WebKit, Chromium and Firefox because DOM bounds
can remain correct when WebKit paints foreignObject content incorrectly.
Exercise node clicks, collapse/expand, wheel zoom and drag pan, including
assertions that pointer gestures change the SVG transform.
Document dependency installation and execution separately from pytest.
The regression fails with the original frontend and passes with the fix.
WebKit paints positioned HTML and opacity layers inside SVG foreignObject
at the SVG origin. Device cards, labels and icons overlap there while
their connections remain at the expected coordinates.
Keep node content in normal flow, place collapse controls with a float
and height-derived negative margin, and use alpha colors for muted icons.
Scope all style changes to the network tree.
Related: #1116
Discussion: https://github.com/netalertx/NetAlertX/discussions/1379
Keep encode_python_string() in front/php/server/util.php, replacing
encode_single_quotes() in place, and remove the standalone
app_conf_encode.php helper file and its require.
Rework the regression test to dispatch the real util.php savesettings
path through the PHP CLI against temporary synthetic config, API and
session directories, covering both scalar string and array string
settings: the generated app.conf must compile with warnings as errors
and parse back to the typed values.
The existing {s-quote} lifecycle is preserved (single quotes are still
written as {s-quote} and converted back by the same consumers), and the
app.conf readers in initialise.py and plugin_helper.py are unchanged.
app.conf is written by util.php saveSettings() as Python source and later
compiled/exec'd by the backend. String settings were emitted into
single-quoted Python literals with only ' encoded (as {s-quote}), so
backslashes were written raw. A regex such as 192\.0\.2\..* then produced
"SyntaxWarning: invalid escape sequence '\.'", valid Python escapes such as
\n were silently reinterpreted, and a trailing backslash made the file fail
to compile.
Move the encoder into a side-effect-free helper, app_conf_encode.php, as
encode_python_string(). It now doubles backslashes before the existing
{s-quote} replacement, so backslashes round-trip unchanged through app.conf
serialization and Python parsing, while single quotes keep using the legacy
{s-quote} placeholder. Both scalar string and array string serialization use
the helper.
Add regression tests that run the real PHP helper through the PHP CLI,
compile the generated source with warnings promoted to errors, and check
the scalar and array round trips.
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