Description:
These options are allowed (not greyed out) and work even if the spreadsheet document is read-only.  This only happens if a complete row is selected (in which case the two Insert Rows operations are allowed) or a complete column (in which case the two Insert Columns operations are allowed).


Steps to Reproduce:
1. Open a spreadsaheet and set it to read only mode.
2. Select a complete row (by clicking on the row number in the left margin).
3. Observe that the Sheet - Insert Rows - Rows Above and Rows Below menu actions are enabled and do the appropriate insertion when clicked.
4. Select a complete column.
5  Observe the same for Sheet - Insert Columns - Columns Left and Columns Right.


Actual Results:
Sheet is changed by inserting rows or columns.

Expected Results:
Either the menu actions should not be enabled, or the "Document opened in read-only mode" should be given.



Reproducible: Always


User Profile Reset: Yes



Additional Info:
Version: 5.4.5.1
Build ID: Gentoo official package
CPU threads: 3; OS: Linux 4.12; UI render: default; VCL: gtk2; 
Locale: en-GB (en_GB.UTF-8); Calc: group