fix(git/status_view): scope dispatch to current tabpage + test cleanup

lua/git/status_view.lua

@@ -62,14 +62,23 @@ local function find_view()
     end
 end
 
+---@param win integer?
+---@return boolean
+local function valid_in_current_tab(win)
+    if not win or not vim.api.nvim_win_is_valid(win) then
+        return false
+    end
+    return vim.api.nvim_win_get_tabpage(win)
+        == vim.api.nvim_get_current_tabpage()
+end
+
 ---@param s ow.Git.StatusView.State
 ---@return integer?
 local function win_for(s)
-    local win = s.win
-    if win and vim.api.nvim_win_is_valid(win) then
-        return win
+    if valid_in_current_tab(s.win) then
+        return s.win
     end
-    win = find_view()
+    local win = find_view()
     s.win = win
     return win
 end
@@ -267,14 +276,10 @@ end
 ---@return integer? left
 ---@return integer? right
 local function adopt_diff_wins(s, status_win)
-    local left = s.diff_left_win
-    local right = s.diff_right_win
-    if left and not vim.api.nvim_win_is_valid(left) then
-        left = nil
-    end
-    if right and not vim.api.nvim_win_is_valid(right) then
-        right = nil
-    end
+    local left = valid_in_current_tab(s.diff_left_win) and s.diff_left_win
+        or nil
+    local right = valid_in_current_tab(s.diff_right_win) and s.diff_right_win
+        or nil
     if left and right then
         return left, right
     end