From ca4f6d05ffe8dbb89bcd809f5470621f4a475f8c Mon Sep 17 00:00:00 2001
From: atse <atse@m-labs.hk>
Date: Tue, 30 Jul 2024 13:31:42 +0800
Subject: [PATCH] =?UTF-8?q?ctrl=5Fpanel:=20Fix=20editing=20fields=20with?=
 =?UTF-8?q?=20unit=20"=C2=B0C"?=
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A faulty regular expression within PyQtGraph causes any Parameter with a
suffix that doesn't begin with an alphanumeric character (as matched
with \w) to act abnormally. For instance, entering "100 °C" into the
input boxes gets interpreted as 10 °C.

Patch the FLOAT_REGEX in PyQtGraph to simply match for any character in
the suffix group.
---
 pytec/pytec/gui/view/lockable_unit.py | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/pytec/pytec/gui/view/lockable_unit.py b/pytec/pytec/gui/view/lockable_unit.py
index 78e519f..431c38f 100644
--- a/pytec/pytec/gui/view/lockable_unit.py
+++ b/pytec/pytec/gui/view/lockable_unit.py
@@ -1,3 +1,5 @@
+import re
+
 from PyQt6.QtCore import QSignalBlocker
 from PyQt6.QtGui import QValidator
 
@@ -7,6 +9,13 @@ from pyqtgraph.parametertree import registerParameterItemType
 from pyqtgraph.parametertree.parameterTypes import SimpleParameter, NumericParameterItem
 
 
+# See https://github.com/pyqtgraph/pyqtgraph/issues/3115
+fn.FLOAT_REGEX = re.compile(
+    r"(?P<number>[+-]?((((\d+(\.\d*)?)|(\d*\.\d+))([eE][+-]?\d+)?)|((?i:nan)|(inf))))\s*"
+    + r"((?P<siPrefix>[u" + fn.SI_PREFIXES + r"]?)(?P<suffix>.*))?$"
+)
+
+
 class LockableUnitSpinBox(SpinBox):
     """
     Extension of PyQtGraph's SpinBox widget.