https://bugs.documentfoundation.org/show_bug.cgi?id=145744

            Bug ID: 145744
           Summary: Improve cell selection outline for better visibility
           Product: LibreOffice
           Version: 7.3.0.0.alpha1+
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Calc
          Assignee: [email protected]
          Reporter: [email protected]

Created attachment 176321
  --> https://bugs.documentfoundation.org/attachment.cgi?id=176321&action=edit
Sample XLSX file

When you click a cell in LO Calc, a selection outline is drawn in black to show
which cell is selected. However, when you create a file in Excel and apply
default borders (which have width of 0.75pt) the selection outline becomes
invisible in LO Calc with zoom levels 160% and above.

To reproduce:
1) Open the attached file (XLSX) and zoom in to around (160% or 180%)
2) Click anywhere inside the table; notice that it is not possible to see the
selection outline; it's very hard (or not possible at all depending on zoom
level) to tell which cell is selected.
3) Click outside and notice that LO Calc's default outline is too thin

This becomes an issue in two major situations:
1) For Excel interoperability, since borders in Excel use by default black
color and width of 0.75 pt and the selection outline becomes invisible in Calc
2) There seems to be an interest in making 0.75pt the default in Calc as well
(see comment #27 in bug 48622); hence this problem may become more noticeable
in the future;

Currently LO Calc uses hairline width (0.05 pt) so this is why the selection
outline is not a problem when using Calc's default settings at any zoom level.

To improve the situation, there are a few ideas:
1) Use a different color (f.i. the system's highlight color)
2) Increase the outline width

PS: The issue does not occur with zoom 100%... however it is very common to use
higher zoom levels and when this is done the outline becomes invisible. This is
why there's room for improvement in how the cell selection outline is handled.

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