fix: expand filename to full path

[linrongbin16]

Regresion test

Platform

• windows
• macOS
• linux

Tasks

• FzfxFiles
  • Press CTRL-U/CTRL-R to switch between restricted/unrestricted mode, and the lines count is consistent when press multiple times.
  • Use V/W/P variants (visual selection, cursor word, yank text).
  • Press ESC to quit, ENTER to open file.
• FzfxLiveGrep
  • Press CTRL-U/CTRL-R to switch between restricted/unrestricted mode, and the lines count is consistent when press multiple times.
  • Use -w to match word only, use -g *.lua to search only lua files.
  • Use V/W/P variants (visual selection, cursor word, yank text).
  • Press ESC to quit, ENTER to open file.
• FzfxBuffers
  • Press CTRL-D to delete buffers.
  • Use V/W/P variants (visual selection, cursor word, yank text).
  • Press ESC to quit, ENTER to open file.
• FzfxGFiles
  • Press CTRL-U/CTRL-W to switch between workspace/current folder mode.
  • Use V/W/P variants (visual selection, cursor word, yank text).
  • Press ESC to quit, ENTER to open file.
• FzfxGCommits
  • Press CTRL-U/CTRL-A to switch between git repo commits/current buffer commits.
  • Use V/W/P variants (visual selection, cursor word, yank text).
  • Press ESC to quit, ENTER to copy commit hash.
• FzfxGBlame
  • Use V/W/P variants (visual selection, cursor word, yank text).
  • Press ESC to quit, ENTER to copy commit hash.
• FzfxLspDiagnostics
  • Press CTRL-U/CTRL-W to switch between workspace/current buffer diagnostics.
  • Use V/W/P variants (visual selection, cursor word, yank text).
  • Press ESC to quit, ENTER to open file.
• FzfxLspDefinitions, FzfxLspTypeDefinitions, FzfxLspReferences, FzfxLspImplementations
  • Go to definitions/references (this is the most 2 easiest use case when developing this lua plugin with lua_ls).
  • Press ESC to quit, ENTER to open file.
• FzfxFileExplorer
  • Press CTRL-U/CTRL-I to switch between filter/include hidden files mode.
  • Press CTRL-L/CTRL-H to cd into folder and cd upper folder.
  • Press ESC to quit, ENTER to open file.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Files	Coverage Δ
lua/fzfx/line_helpers.lua	93.67% <100.00%> (ø)

... and 1 file with indirect coverage changes

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