Redo selection of the first item to fix shift-select of multiple items

[mdonatas]

Fixes

When opening FormCommit - first item in unstaged files is selected. Then when shift-clicking on 2nd and further items to select 1fst through clicked items, the selection is made not from the top but from the bottom.

Proposed changes

• Reset internal ListView "last selected item" index by resetting Selected to true for the first selected item.

Screenshots

Before

Notice that when shift-clicking after refresh control acts as if last item in the list has focus and selection happens from it till the item being clicked on.

After

Test methodology

• Manual

Test environment(s)

• Git Extensions 33.33.33
• Build cb8954c (Dirty)
• Git 2.37.3.windows.1
• Microsoft Windows NT 10.0.22000.0
• .NET 6.0.10
• DPI 192dpi (200% scaling)

Merge strategy

I agree that the maintainer squash merge this PR (if the commit message is clear).

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✒️ I contribute this code under The Developer Certificate of Origin.

[mdonatas]

This single-line fix took probably two hours to find and solve 😅 (and then another hour to record the gifs 🤣)

[mstv]

👍 Thank you

[gerhardol]

+1
Have not run

This single-line fix took probably two hours to find and solve 😅 (and then another hour to record the gifs 🤣)

Changes like this can take a lot more time than that...

[RussKie]

🚀