https://bugs.documentfoundation.org/show_bug.cgi?id=155526

            Bug ID: 155526
           Summary: Moving average trend line equation on chart does not
                    show period and R^2
           Product: LibreOffice
           Version: 7.6.0.0 alpha0+
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: trivial
          Priority: medium
         Component: Calc
          Assignee: libreoffice-bugs@lists.freedesktop.org
          Reporter: vladislav.taraka...@bk.ru

Description:
If click "Insert R^2 and Trend Line Equation" after plotting the moving average
for the chart, then the lines "Moving Average trend line with period = %PERIOD"
and "R^2 = NaN" will be obtained, which does not look like the expected
behavior

Steps to Reproduce:
1. Write arbitrary numbers in any column
2. Select the numbers written and click "Insert Chart" on the toolbar
3. Choose any type of chart and build a chart
4. Select data series and in the context menu click "Insert Trend Line..."
5. Select "Moving Average" type and click "ok"
6. Select trend line and in the context menu click "Insert R^2 and Trend Line
Equation"

Actual Results:
The strings "Moving Average trend line with period = %PERIOD" and "R^2 = NaN"
are displayed

Expected Results:
Display strings like "Moving Average trend line with period = 2"


Reproducible: Always


User Profile Reset: No

Additional Info:
Version: 7.6.0.0.alpha1+ (X86_64) / LibreOffice Community
Build ID: efcbd2306f0310809f2d6f1db086b839055c77f6
CPU threads: 12; OS: Linux 5.15; UI render: default; VCL: gtk3
Locale: ru-RU (ru_RU.UTF-8); UI: en-US
Calc: CL threaded

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