fix(log-analysis): preserve fractional parameter values in review dialogs

Format parameter values without truncating decimals in the log-quality
parameter-change review dialog.

Add coverage for integral and fractional display values.

Signed-off-by: Dr.-Ing. Amilcar do Carmo Lucas <amilcar.lucas@iav.de>

Author: amilcarlucas

ardupilot_methodic_configurator/frontend_tkinter_log_quality.py

@@ -45,6 +45,11 @@
 )
 
 
+def _format_parameter_value(value: float) -> str:
+    """Format a parameter value without hiding fractional changes."""
+    return str(int(value)) if value.is_integer() else str(value)
+
+
 class LogQualityReportWindow(BaseWindow):  # pylint: disable=too-many-instance-attributes
     """Displays log analysis results as a beginner-friendly, detailed dashboard."""
 
@@ -185,9 +190,14 @@ def _open_review_dialog(self, fixes: list[tuple[str, float, float, list[str]]])
             row = ttk.Frame(rows_frame)
             row.pack(fill=tk.X, pady=4)
             ttk.Label(row, text=param_name, width=18, font=("TkDefaultFont", 11, "bold")).pack(side=tk.LEFT)
-            ttk.Label(row, text=str(int(current)), foreground="gray").pack(side=tk.LEFT, padx=(0, 6))
+            ttk.Label(row, text=_format_parameter_value(current), foreground="gray").pack(side=tk.LEFT, padx=(0, 6))
             ttk.Label(row, text="->").pack(side=tk.LEFT, padx=(0, 6))
-            value_lbl = ttk.Label(row, text=str(int(proposed)), foreground="darkgreen", font=("TkDefaultFont", 11, "bold"))
+            value_lbl = ttk.Label(
+                row,
+                text=_format_parameter_value(proposed),
+                foreground="darkgreen",
+                font=("TkDefaultFont", 11, "bold"),
+            )
             value_lbl.pack(side=tk.LEFT)
             show_tooltip(value_lbl, "\n".join(f"- {r}" for r in reasons))
 

tests/test_frontend_tkinter_log_quality.py

@@ -0,0 +1,40 @@
+#!/usr/bin/env python3
+
+"""
+Tests for ardupilot_methodic_configurator/frontend_tkinter_log_quality.py.
+
+This file is part of ArduPilot Methodic Configurator. https://github.com/ArduPilot/MethodicConfigurator
+
+SPDX-FileCopyrightText: 2024-2026 Amilcar do Carmo Lucas <amilcar.lucas@iav.de>
+
+SPDX-License-Identifier: GPL-3.0-or-later
+"""
+
+import pytest
+
+from ardupilot_methodic_configurator.frontend_tkinter_log_quality import _format_parameter_value
+
+
+@pytest.mark.parametrize(
+    ("value", "expected"),
+    [
+        (123.0, "123"),
+        (0.15, "0.15"),
+        (1.25, "1.25"),
+    ],
+)
+def test_parameter_value_formatting_preserves_fractional_changes(value: float, expected: str) -> None:
+    """
+    Display parameter values without silently changing their meaning.
+
+    GIVEN integral and fractional parameter values,
+    WHEN they are formatted for the parameter-change review dialog,
+    THEN integral values omit an unnecessary decimal and fractional values are preserved.
+    """
+    # Arrange: parametrized parameter values represent pending FC changes.
+
+    # Act: format the value shown to the user.
+    actual = _format_parameter_value(value)
+
+    # Assert: the text faithfully represents the value that will be uploaded.
+    assert actual == expected