Add FORGIT_STASH_SHOW_PREVIEW_GIT_OPTS

This variable can be used to tune the rendering of the stash preview.

The following example allows listing the content of the stash before
opening it.

FORGIT_STASH_SHOW_PREVIEW_GIT_OPTS="--patch-with-stat --stat-count=10"

README.md

@@ -156,7 +156,7 @@ Install `forgit` in just one click.
 | <kbd>Alt</kbd> - <kbd>E</kbd>                 | Open file in default editor (when possible) |
 
 \* Available when the selection contains a commit hash or a stash ID.
-For linux users `FORGIT_COPY_CMD` should be set to make copy work. Example: `FORGIT_COPY_CMD='xclip -selection clipboard'`.
+For Linux users `FORGIT_COPY_CMD` should be set to make copy work. Example: `FORGIT_COPY_CMD='xclip -selection clipboard'`.
 
 # ⚙  Options
 
@@ -243,7 +243,7 @@ These are passed to the according `git` calls.
 | `gct`    | `FORGIT_CHECKOUT_TAG_GIT_OPTS`                                              |
 | `gco`    | `FORGIT_CHECKOUT_COMMIT_GIT_OPTS`                                           |
 | `grc`    | `FORGIT_REVERT_COMMIT_GIT_OPTS`                                             |
-| `gss`    | `FORGIT_STASH_SHOW_GIT_OPTS`                                                |
+| `gss`    | `FORGIT_STASH_SHOW_GIT_OPTS`, `FORGIT_STASH_SHOW_PREVIEW_GIT_OPTS`          |
 | `gsp`    | `FORGIT_STASH_PUSH_GIT_OPTS`                                                |
 | `gclean` | `FORGIT_CLEAN_GIT_OPTS`                                                     |
 | `grb`    | `FORGIT_REBASE_GIT_OPTS`                                                    |
@@ -339,7 +339,7 @@ export FORGIT_LOG_FZF_OPTS='
 
 # 📦 Optional dependencies
 
-- [`delta`](https://github.com/dandavison/delta) / [`diff-so-fancy`](https://github.com/so-fancy/diff-so-fancy): For better human readable diffs.
+- [`delta`](https://github.com/dandavison/delta) / [`diff-so-fancy`](https://github.com/so-fancy/diff-so-fancy): For better human-readable diffs.
 
 - [`bat`](https://github.com/sharkdp/bat.git): Syntax highlighting for `gitignore`.
 

bin/git-forgit

@@ -395,7 +395,9 @@ _forgit_reset_head() {
 _forgit_stash_show_preview() {
     local stash
     stash=$(echo "$1" | cut -d: -f1)
-    _forgit_git_stash_show "$stash" | _forgit_pager diff
+    forgit_stash_show_preview_git_opts=()
+    _forgit_parse_array _forgit_stash_show_preview_git_opts "$FORGIT_STASH_SHOW_PREVIEW_GIT_OPTS"
+    _forgit_git_stash_show "${_forgit_stash_show_preview_git_opts[@]}" -- "$stash" | _forgit_pager diff
 }
 
 _forgit_git_stash_show() {