fix(file explorer): record cannot go upper (ctrl-h) issue in empty dir

[linrongbin16]

Fix #507 .

Regresion test

Platforms

• [x] windows
• [x] macOS
• [x] linux

Tasks

• [ ] FzfxFiles
  • Press CTRL-J/CTRL-K to move down/up and preview contents.
  • 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/R variants (visual selection, cursor word, yank text, resume last).
  • Press ESC to quit, ENTER to open file, and open the test/hello world.txt, test/goodbye world/goodbye.lua files.
  • Both fd and find works.
• [ ] FzfxLiveGrep
  • Press CTRL-J/CTRL-K to move down/up and preview contents.
  • 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/R variants (visual selection, cursor word, yank text, resume last).
  • Press ESC to quit, ENTER to open file, and open the test/hello world.txt, test/goodbye world/goodbye.lua files.
  • Both rg and grep works.
• [ ] FzfxBuffers
  • Press CTRL-J/CTRL-K to move down/up and preview contents.
  • Press CTRL-D to delete buffers, and delete the test/hello world.txt, test/goodbye world/goodbye.lua buffers.
  • Use V/W/P/R variants (visual selection, cursor word, yank text, resume last).
  • Press ESC to quit, ENTER to open file.
• [ ] FzfxGFiles
  • Press CTRL-J/CTRL-K to move down/up and preview contents.
  • Press CTRL-U/CTRL-W to switch between workspace/current folder mode.
  • Use V/W/P/R variants (visual selection, cursor word, yank text, resume last).
  • Press ESC to quit, ENTER to open file.
• [ ] FzfxGLiveGrep
  • Press CTRL-J/CTRL-K to move down/up and preview contents.
  • Use V/W/P/R variants (visual selection, cursor word, yank text, resume last).
  • Press ESC to quit, ENTER to open file.
• [ ] FzfxGStatus
  • Press CTRL-J/CTRL-K to move down/up and preview contents.
  • Press CTRL-U/CTRL-W to switch between workspace/current folder mode.
  • Use V/W/P/R variants (visual selection, cursor word, yank text, resume last).
  • Press ESC to quit, ENTER to open file.
  • Both with/without delta works.
• [ ] FzfxGBranches
  • Press CTRL-J/CTRL-K to move down/up and preview contents.
  • Press CTRL-R/CTRL-O to switch between local/remote branches.
  • Use V/W/P/R variants (visual selection, cursor word, yank text, resume last).
  • Press ESC to quit, ENTER to checkout branch.
• [ ] FzfxGCommits
  • Press CTRL-J/CTRL-K to move down/up and preview contents.
  • Press CTRL-U/CTRL-A to switch between git repo commits/current buffer commits.
  • Use V/W/P/R variants (visual selection, cursor word, yank text, resume last).
  • Press ESC to quit, ENTER to copy commit hash.
  • Both with/without delta works.
• [ ] FzfxGBlame
  • Press CTRL-J/CTRL-K to move down/up and preview contents.
  • Use V/W/P/R variants (visual selection, cursor word, yank text, resume last).
  • Press ESC to quit, ENTER to copy commit hash.
  • Both with/without delta works.
• [ ] FzfxLspDiagnostics
  • Press CTRL-J/CTRL-K to move down/up and preview contents.
  • Press CTRL-U/CTRL-W to switch between workspace/current buffer diagnostics.
  • Use V/W/P/R variants (visual selection, cursor word, yank text, resume last).
  • Press ESC to quit, ENTER to open file.
• [ ] FzfxLspDefinitions, FzfxLspTypeDefinitions, FzfxLspReferences, FzfxLspImplementations
  • Press CTRL-J/CTRL-K to move down/up and preview contents.
  • 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.
• [ ] FzfxLspIncomingCalls, FzfxLspOutgoingCalls
  • Press CTRL-J/CTRL-K to move down/up and preview contents.
  • Go to incoming/outgoing calls.
  • Press ESC to quit, ENTER to open file.
• [ ] FzfxCommands
  • Press CTRL-J/CTRL-K to move down/up and preview contents.
  • Press CTRL-U/CTRL-E/CTRL-A to switch between user/ex/all vim commands.
  • Use V/W/P/R variants (visual selection, cursor word, yank text, resume last).
  • Press ESC to quit, ENTER to feed vim command.
• [ ] FzfxKeyMaps
  • Press CTRL-J/CTRL-K to move down/up and preview contents.
  • Press CTRL-O/CTRL-I/CTRL-A/CTRL-V to switch between normal/insert/visual/all vim key mappings.
  • Use V/W/P/R variants (visual selection, cursor word, yank text, resume last).
  • Press ESC to quit, ENTER to feed vim keys.
• [x] FzfxFileExplorer
  • Press CTRL-J/CTRL-K to move down/up and preview contents.
  • Press CTRL-U/CTRL-R to switch between filter/include hidden files mode.
  • Press ALT-L/ALT-H to cd into folder and cd upper folder.
  • Use V/W/P/R variants (visual selection, cursor word, yank text, resume last).
  • Press ESC to quit, ENTER to open file, and open the test/hello world.txt, test/goodbye world/goodbye.lua files.
  • All eza/lsd/ls works.

[codecov[bot]]

Codecov Report

Attention: 14 lines in your changes are missing coverage. Please review.

Comparison is base (d44e4dc) 80.21% compared to head (eaf24b8) 80.10%. Report is 2 commits behind head on main.

:exclamation: Current head eaf24b8 differs from pull request most recent head 3cda437. Consider uploading reports for the commit 3cda437 to get more accurate results

Files	Patch %	Lines
lua/fzfx/detail/general.lua	0.00%	6 Missing :warning:
lua/fzfx/cfg/file_explorer.lua	63.63%	4 Missing :warning:
lua/fzfx/detail/rpcserver.lua	20.00%	4 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #551 +/- ## ========================================== - Coverage 80.21% 80.10% -0.12% ========================================== Files 45 45 Lines 4509 4528 +19 ========================================== + Hits 3617 3627 +10 - Misses 892 901 +9 ```

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