Update search position (match x of y) when changing the selection in a list view

[stefanhaller]

When searching (not filtering) in a list view using /, moving the selection now updates the "x of y" indicator of the search results to the last one before the selection. Pressing n again searches from there rather than from the previously shown result.

Also see corresponding gocui PR at jesseduffield/gocui#95.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
Report missing for a0e81c91	✅ 98.31%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (a0e81c9)	Report Missing	Report Missing	Report Missing
Head commit (65edd99)	59415	51742	87.09%

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#5169)	59	58	98.31%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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